Things to be aware of when using week numbers with years.
<?php
echo date("YW", strtotime("2011-01-07")); // gives 201101
echo date("YW", strtotime("2011-12-31")); // gives 201152
echo date("YW", strtotime("2011-01-01")); // gives 201152 too
?>
BUT
<?php
echo date("oW", strtotime("2011-01-07")); // gives 201101
echo date("oW", strtotime("2011-12-31")); // gives 201152
echo date("oW", strtotime("2011-01-01")); // gives 201052 (Year is different than previous example)
?>
Reason:
Y is year from the date
o is ISO-8601 year number
W is ISO-8601 week number of year
Conclusion:
if using 'W' for the week number use 'o' for the year.
date
(PHP 4, PHP 5, PHP 7)
date — Formatiert ein(e) angegebene(s) Ortszeit/Datum
Beschreibung
string date
( string
$format
[, int $timestamp = time()
] )
Gibt einen formatierten String anhand eines vorzugebenden Musters
zurück. Dabei wird entweder der angegebene
Timestamp oder die gegenwärtige Zeit berücksichtigt,
wenn kein Timestamp angegegeben wird. Mit anderen Worten ausgedrückt: der Parameter
Timestamp ist optional und falls dieser nicht angegeben wird,
wird der Wert der Funktion time() angenommen.
Parameter-Liste
-
format -
Das Muster des auszugebenden Datums-/Zeit-String. Unten sind die verfügbaren Formatierungsoptionen angegeben. Es gibt auch verschiedene vordefinierte Konstanten, die verwendet werden können, z.B. enthält
DATE_RSSdas Formatierungsmuster 'D, d M Y H:i:s'.Die folgenden Zeichen werden im Parameter FormaterkanntFormat-ZeichenBeschreibung Beispiel für Rückgabewerte Tag --- --- d Tag des Monats, 2-stellig mit führender Null 01 bis 31 D Wochentag, gekürzt auf drei Buchstaben Mon bis Sun j Tag des Monats ohne führende Nullen 1 bis 31 l (kleines 'L') Ausgeschriebener Wochentag Sunday bis Saturday N Numerische Repräsentation des Wochentages gemäß ISO-8601 (in PHP 5.1.0 hinzugefügt) 1 (für Montag) bis 7 (für Sonntag) S Anhang der englischen Aufzählung für einen Monatstag, zwei Zeichen st, nd, rd oder th. Zur Verwendung mit j empfohlen. w Numerischer Tag einer Woche 0 (für Sonntag) bis 6 (für Samstag) z Der Tag des Jahres (von 0 beginnend) 0 bis 365 Woche --- --- W ISO-8601 Wochennummer des Jahres, die Woche beginnt am Montag (hinzugefügt in PHP 4.1.0) Beispiel: 42 (die 42. Woche im Jahr) Monat --- --- F Monat als ganzes Wort, wie January oder March January bis December m Monat als Zahl, mit führenden Nullen 01 bis 12 M Monatsname mit drei Buchstaben Jan bis Dec n Monatszahl, ohne führende Nullen 1 bis 12 t Anzahl der Tage des angegebenen Monats 28 bis 31 Jahr --- --- L Schaltjahr oder nicht 1 für ein Schaltjahr, ansonsten 0 o Jahreszahl gemäß ISO-8601. Dies ergibt den gleichen Wert wie Y, außer wenn die ISO-Kalenderwoche (W) zum vorhergehenden oder nächsten Jahr gehört, wobei dann jenes Jahr verwendet wird (in PHP 5.1.0 hinzugefügt). Beispiele: 1999 oder 2003 Y Vierstellige Jahreszahl Beispiele: 1999 oder 2003 y Jahreszahl, zweistellig Beispiele: 99 oder 03 Uhrzeit --- --- a Kleingeschrieben: Ante meridiem (Vormittag) und Post meridiem (Nachmittag) am oder pm A Großgeschrieben: Ante meridiem (Vormittag) und Post meridiem (Nachmittag) AM oder PM B Swatch-Internet-Zeit 000 bis 999 g Stunde im 12-Stunden-Format, ohne führende Nullen 1 bis 12 G Stunde im 24-Stunden-Format, ohne führende Nullen 0 bis 23 h Stunde im 12-Stunden-Format, mit führenden Nullen 01 bis 12 H Stunde im 24-Stunden-Format, mit führenden Nullen 00 bis 23 i Minuten, mit führenden Nullen 00 bis 59 s Sekunden, mit führenden Nullen 00 bis 59 u Mikrosekunden (hinzugefügt in PHP 5.2.2). Beachten Sie, dass date() immer die Ausgabe 000000 erzeugen wird, da es einen Integer als Parameter erhält, wohingegen DateTime::format() Mikrosekunden unterstützt, wenn DateTime mit Mikrosekunden erzeugt wurde. Beispiel: 654321 Zeitzone --- --- e Zeitzonen-Bezeichner (hinzugefügt in PHP 5.1.0) Beispiele: UTC, GMT, Atlantic/Azores I (großes 'i') Fällt ein Datum in die Sommerzeit 1 bei Sommerzeit, ansonsten 0. O Zeitunterschied zur Greenwich time (GMT) in Stunden Beispiel: +0200 P Zeitunterschied zur Greenwich time (GMT) in Stunden mit Doppelpunkt zwischen Stunden und Minuten (hinzugefügt in PHP 5.1.3) Beispiel: +02:00 T Abkürzung der Zeitzone Beispiele: EST, MDT ... Z Offset der Zeitzone in Sekunden. Der Offset für Zeitzonen westlich von UTC ist immer negativ und für Zeitzonen östlich von UTC immer positiv. -43200 bis 50400 Vollständige(s) Datum/Uhrzeit --- --- c ISO 8601 Datum (hinzugefügt in PHP 5) 2004-02-12T15:19:21+00:00 r Gemäß » RFC 2822 formatiertes Datum Beispiel: Thu, 21 Dec 2000 16:01:07 +0200 U Sekunden seit Beginn der UNIX-Epoche (January 1 1970 00:00:00 GMT) Siehe auch time() Nicht erkannte Zeichen werden unverändert ausgegeben. Das Z-Format gibt beim Gebrauch von gmdate() immer 0 zurück.
Hinweis:
Weil diese Funktion nur Integer-Zeitstempel akzeptiert, ist die Formatanweisung u nur nützlich, wenn man die Funktion date_format() mit von Benutzern angegebenen Timestamps aus der Funktion date_create() verwendet.
-
timestamp -
Der optionale Parameter
timestampist ein Unix Timestamp als integer oder die aktuelle lokale Zeit wenn keintimestampübergeben wurde. Er entspricht dann also dem Ergebnis der Funktion time().
Rückgabewerte
Gibt eine formatierte Datums-Zeichenkette zurück. Falls ein
nicht numerischer Wert als timestamp
übergeben wird, wird FALSE zurückgegeben und ein Fehler
der Stufe E_WARNING erzeugt.
Fehler/Exceptions
Jeder Aufruf der Datums- und Zeitfunktionen
generiert eine E_NOTICE-Warnung,
wenn die Zeitzone ungültig ist und eine E_STRICT-Nachricht
oder eine E_WARNING-Warnung,
wenn die Systemeinstellung oder die TZ-Umgebungsvariable
genutzt wird. Siehe auch date_default_timezone_set()
Changelog
| Version | Beschreibung |
|---|---|
| 5.1.0 | Der gültige Bereich eines Timestamp liegt typischerweise zwischen Fri, 13 Dec 1901 20:45:54 GMT und Tue, 19 Jan 2038 03:14:07 GMT. (Das entspricht den minimalen und maximalen Werten für einen vorzeichenbehafteten 32-Bit Integer). Vor PHP 5.1.0 war dieser Bereich auf manchen Systemen (z.B. Windows) eingeschränkt auf 01.01.1971 bis 19.01.2038. |
| 5.1.0 |
Erzeugt nun |
| 5.1.1 |
Es gibt nützliche Konstanten
von üblichen Datums-/Zeitformaten, die als
Format-Parameter übergeben werden können.
|
Beispiele
Beispiel #1 date()-Beispiele
<?php
// Die Standard-Zeitzone, die verwendet werden soll, setzen.
// Verfügbar seit PHP 5.1
date_default_timezone_set('UTC');
// Gibt etwas aus wie: 'Monday'
echo date("l");
// Gibt etwas aus wie: 'Monday 8th of August 2005 03:12:46 PM'
echo date('l jS \of F Y h:i:s A');
// Gibt aus: 'July 1, 2000 ist ein Saturday'
echo "July 1, 2000 ist ein " . date("l", mktime(0, 0, 0, 7, 1, 2000));
/* Verwende die Konstanten im Format-Parameter */
// Gibt etwas aus wie: Wed, 25 Sep 2013 15:28:57 -0700
echo date(DATE_RFC822);
// Gibt etwas aus wie '2000-07-01T00:00:00+00:00'
echo date(DATE_ATOM, mktime(0, 0, 0, 7, 1, 2000));
?>
Möchten Sie verhindern, dass ein erkanntes Zeichen im Formatstring ersetzt wird, sollten Sie dieses Zeichen mit einem vorangestellten Backslash escapen. Ist das Zeichen mit dem Backslash bereits eine spezielle Zeichenfolge, müssen Sie diesen Backslash ebenso escapen.
Beispiel #2 Escaping von Zeichen in date()
<?php
// Gibt etwas ähnliches aus wie 'Wednesday the 15th'
echo date('l \t\h\e jS');
?>
Es ist möglich, date() und mktime() gleichzeitig zu verwenden, um Datumsangaben in der Zukunft oder Vergangenheit zu bestimmen.
Beispiel #3 date() und mktime()-Beispiele
<?php
$morgen = mktime(0, 0, 0, date("m") , date("d")+1, date("Y"));
$letztermonat = mktime(0, 0, 0, date("m")-1, date("d"), date("Y"));
$naechstesjahr = mktime(0, 0, 0, date("m"), date("d"), date("Y")+1);
?>
Hinweis:
Dieses Vorgehen kann zu verlässlicheren Ergebnissen führen, als simples addieren oder subtrahieren der Anzahl von Sekunden in Tagen oder Monaten zu einem Timestamp, da Sommer- und Winterzeit berücksichtigt werden.
Es folgen einige Beispiele zur date()-Formatierung. Beachten Sie, dass Sie alle anderen Zeichen escapen sollten, da alle Zeichen, die im Augenblick eine spezielle Bedeutung haben, unerwünschte Resultate liefern. Bei allen weiteren Zeichen kann es durchaus möglich sein, dass diesen in zukünftigen PHP-Versionen eine Bedeutung zukommt. Beim Escapen sollten Sie darauf achten, einfache Anführungszeichen zu benutzen, damit Zeichenfolgen wie zum Beispiel \n zu keinem Zeilenumbruch führen.
Beispiel #4 date()-Formatierungen
<?php
// Angenommen, heute ist der 10. März 2001, 17:16:18 Uhr und wir
// befinden uns in der Zeitzone Mountain Standard Time (MST)
$heute = date("F j, Y, g:i a"); // March 10, 2001, 5:16 pm
$heute = date("m.d.y"); // 03.10.01
$heute = date("j, n, Y"); // 10, 3, 2001
$heute = date("Ymd"); // 20010310
$heute = date('h-i-s, j-m-y, it is w Day'); // 05-16-18, 10-03-01, 1631 1618 6 Satpm01
$heute = date('\i\t \i\s \t\h\e jS \d\a\y.'); // it is the 10th day.
$heute = date("D M j G:i:s T Y"); // Sat Mar 10 17:16:18 MST 2001
$heute = date('H:m:s \m \i\s\ \m\o\n\t\h'); // 17:03:18 m is month
$heute = date("H:i:s"); // 17:16:18
$heute = date("Y-m-d H:i:s"); // 2001-03-10 17:16:18 (Das MySQL DATETIME Format)
?>
Um Datumsangaben in anderen Sprachen auszugeben, sollten Sie die Funktionen setlocale() und strftime() statt date() verwendet werden.
Anmerkungen
Hinweis:
Um einen Zeitstempel aus einer Textrepräsentation eines Datums zu erzeugen, kann die Funktion strtotime() verwendet werden. Einige Datenbanken haben außerdem Funktionen, mit denen ihre Datumsformate in Zeitstempel konvertiert werden können (wie z.B. die Funktion » UNIX_TIMESTAMP von MySQL).
Tipp
Der Zeitstempel des Verarbeitungsbeginns der HTTP-Anfrage wird seit PHP 5.1 in $_SERVER['REQUEST_TIME'] bereitgestellt.
Siehe auch
- gmdate() - Formatiert eine GMT/UTC Zeit-/Datumsangabe
- idate() - Format a local time/date as integer
- getdate() - Gibt Datums- und Zeitinformationen zurück
- getlastmod() - Uhrzeit der letzten Änderung eines Scripts
- mktime() - Gibt den Unix-Timestamp/Zeitstempel für ein Datum zurück
- strftime() - Formatiert eine Zeit-/Datumsangabe nach den lokalen Einstellungen
- time() - Gibt den aktuellen Unix-Timestamp/Zeitstempel zurück
- strtotime() - Wandelt ein beliebiges in englischer Textform angegebenes Datum in einen UNIX-Zeitstempel (Timestamp) um
- Vordefinierte DateTime-Konstanten
add a note
User Contributed Notes 51 notes
Jimmy ¶
4 years ago
ivijan dot stefan at gmail dot com ¶
1 year ago
If you have a problem with the different time zone, this is the solution for that.
<?php
// first line of PHP
$defaultTimeZone='UTC';
if(date_default_timezone_get()!=$defaultTimeZone)) date_default_timezone_set($defaultTimeZone);
// somewhere in the code
function _date($format="r", $timestamp=false, $timezone=false)
{
$userTimezone = new DateTimeZone(!empty($timezone) ? $timezone : 'GMT');
$gmtTimezone = new DateTimeZone('GMT');
$myDateTime = new DateTime(($timestamp!=false?date("r",(int)$timestamp):date("r")), $gmtTimezone);
$offset = $userTimezone->getOffset($myDateTime);
return date($format, ($timestamp!=false?(int)$timestamp:$myDateTime->format('U')) + $offset);
}
/* Example */
echo 'System Date/Time: '.date("Y-m-d | h:i:sa").'<br>';
echo 'New York Date/Time: '._date("Y-m-d | h:i:sa", false, 'America/New_York').'<br>';
echo 'Belgrade Date/Time: '._date("Y-m-d | h:i:sa", false, 'Europe/Belgrade').'<br>';
echo 'Belgrade Date/Time: '._date("Y-m-d | h:i:sa", 514640700, 'Europe/Belgrade').'<br>';
?>
This is the best and fastest solution for this problem. Working almost identical to date() function only as a supplement has the time zone option.
Anonymous ¶
3 months ago
If timestamp is a string, date converts it to an integer in a possibly unexpected way:
<?php
echo (int)'0x10'; //0
echo intval('0x10'); //0
echo date('s', '0x10'); //gives 16
//however, no octal conversion:
echo date('s', '010'); //gives 10
?>
(PHP 5.6.16)
FiraSEO ¶
3 years ago
this how you make an HTML5 <time> tag correctly
<?php
echo '<time datetime="'.date('c').'">'.date('Y - m - d').'</time>';
?>
in the "datetime" attribute you should put a machine-readable value which represent time , the best value is a full time/date with ISO 8601 ( date('c') ) ,,, the attr will be hidden from users
and it doesn't really matter what you put as a shown value to the user,, any date/time format is okay !
This is very good for SEO especially search engines like Google .
Charlie ¶
4 months ago
For HTML5 datetime-local HTML input controls (http://www.w3.org/TR/html-markup/input.datetime-local.html) use format example: 1996-12-19T16:39:57
To generate this, escape the 'T', as shown below:
<?php
date('Y-m-d\TH:i:s');
?>
adityabhai at gmail dot com ¶
2 years ago
For Microseconds, we can get by following:
echo date('Ymd His'.substr((string)microtime(), 1, 8).' e');
Thought, it might be useful to someone !
bakerj417 at gmail dot com ¶
4 years ago
If you are having an issue getting u to work so is everyone else. The solution that I am using which I found on another site(so not taking credit) is to use this:
date("Y/m/d H:i:s"). substr((string)microtime(), 1, 6);
that will give you:
yyyy/mm/dd hh:ii:ss.uuuuuu
hope this helps someone in need!
thanks all
eduardo at digmotor dot com dot br ¶
7 years ago
Thanks to tcasparr at gmail dot com for the great idea (at least for me) ;)
I changed the code a little to replicate the functionality of date_parse_from_format, once I don't have PHP 5.3.0 yet. This might be useful for someone. Hope you don't mind changing your code tcasparr at gmail dot com.
<?php
/*******************************************************
* Simple function to take in a date format and return array of associated
* formats for each date element
*
* @return array
* @param string $strFormat
*
* Example: Y/m/d g:i:s becomes
* Array
* (
* [year] => Y
* [month] => m
* [day] => d
* [hour] => g
* [minute] => i
* [second] => s
* )
*
* This function is needed for PHP < 5.3.0
********************************************************/
function dateParseFromFormat($stFormat, $stData)
{
$aDataRet = array();
$aPieces = split('[:/.\ \-]', $stFormat);
$aDatePart = split('[:/.\ \-]', $stData);
foreach($aPieces as $key=>$chPiece)
{
switch ($chPiece)
{
case 'd':
case 'j':
$aDataRet['day'] = $aDatePart[$key];
break;
case 'F':
case 'M':
case 'm':
case 'n':
$aDataRet['month'] = $aDatePart[$key];
break;
case 'o':
case 'Y':
case 'y':
$aDataRet['year'] = $aDatePart[$key];
break;
case 'g':
case 'G':
case 'h':
case 'H':
$aDataRet['hour'] = $aDatePart[$key];
break;
case 'i':
$aDataRet['minute'] = $aDatePart[$key];
break;
case 's':
$aDataRet['second'] = $aDatePart[$key];
break;
}
}
return $aDataRet;
}
?>
Also, if you need to change the format of dates:
<?php
function changeDateFormat($stDate,$stFormatFrom,$stFormatTo)
{
// When PHP 5.3.0 becomes available to me
//$date = date_parse_from_format($stFormatFrom,$stDate);
//For now I use the function above
$date = dateParseFromFormat($stFormatFrom,$stDate);
return date($stFormatTo,mktime($date['hour'],
$date['minute'],
$date['second'],
$date['month'],
$date['day'],
$date['year']));
}
?>
Tim Connolly ¶
3 years ago
Here's my solution for looking up the month number by name (used when parsing an 'ls'):
<?php
for($m=1;$m<=12;$m++){
$month=date("M",mktime(0,0,0,$m,1,2000));
$mon["$month"]=$m;
}
?>
@PeteWilliams ¶
5 years ago
If you want to use HTML5's <date> tag, the following code will generate the machine-readable value for the 'datetime' attribute:
<?php
/**
* formats the date passed into format required by 'datetime' attribute of <date> tag
* if no intDate supplied, uses current date.
* @param intDate integer optional
* @return string
**/
function getDateTimeValue( $intDate = null ) {
$strFormat = 'Y-m-d\TH:i:s.uP';
$strDate = $intDate ? date( $strFormat, $intDate ) : date( $strFormat ) ;
return $strDate;
}
echo getDateTimeValue();
?>
matthew dot hotchen at worldfirst dot com ¶
2 years ago
FYI: there's a list of constants with predefined formats on the DateTime object, for example instead of outputting ISO 8601 dates with:
<?php
echo date('c');
?>
or
<?php
echo date('Y-m-d\TH:i:sO');
?>
You can use
<?php
echo date(DateTime::ISO8601);
?>
instead, which is much easier to read.
Anonymous ¶
7 years ago
Correct format for a MySQL DATETIME column is
<?php $mysqltime = date ("Y-m-d H:i:s", $phptime); ?>
Just.Kevin ¶
6 years ago
In order to determine if a year is a leap year an earlier poster suggested simply checking to see if the year is a multiple of four:
<?php
function is_leapyear_broken($year = 2004) {
return ($year%4)==0;
}
?>
While this will work for the majority of years it will not work on years that are multiples of 100 but not multiples of 400 i.e.(2100).
A function not using php's date() function that will also account for this small anomaly in leap years:
<?php
function is_leapyear_working($year = 2004) {
if((($year%4==0) && ($year%100!=0)) || $year%400==0) {
return true;
}
return false;
}
?>
While is_leapyear_working will not return true for the few non-leap years divisible by four I couldn't tell you if this is more or less efficient than using php's date() as an even earlier poster suggested:
<?php
function is_leapyear($year = 2004) {
$is_leap = date('L', strtotime("$year-1-1"));
return $is_leap;
}
?>
Bas Vijfwinkel ¶
4 years ago
Note that some formatting options are different from MySQL.
For example using a 24 hour notation without leading zeros is the option '%G' in PHP but '%k' in MySQL.
When using dynamically generated date formatting string, be careful to generate the correct options for either PHP or MySQL.
Horst Frank ¶
22 days ago
in some cases you can't or don't like to change the setlocal(), but you want to get a translated date(). This function is an example for a geman translation-table.
function ddate ($format,$timestamp) {
$trans = array(
'Monday' => 'Montag',
'Tuesday' => 'Dienstag',
'Wednesday' => 'Mittwoch',
'Thursday' => 'Donnerstag',
'Friday' => 'Freitag',
'Saturday' => 'Samstag',
'Sunday' => 'Sonntag',
'Mon' => 'Mo',
'Tue' => 'Di',
'Wed' => 'Mi',
'Thu' => 'Do',
'Fri' => 'Fr',
'Sat' => 'Sa',
'Sun' => 'So',
'January' => 'Januar',
'February' => 'Februar',
'March' => 'März',
'May' => 'Mai',
'June' => 'Juni',
'July' => 'Juli',
'October' => 'Oktober',
'December' => 'Dezember',
'Mar' => 'Mär',
'Oct' => 'Okt',
'Dec' => 'Dez',
);
return strtr(date($format,$timestamp),$trans);
}
Anonymous ¶
2 years ago
It's common for us to overthink the complexity of date/time calculations and underthink the power and flexibility of PHP's built-in functions. Consider http://php.net/manual/en/function.date.php#108613
<?php
function get_time_string($seconds)
{
return date('H:i:s', strtotime("2000-01-01 + $seconds SECONDS"));
}
gerben at gerbenwijnja dot nl ¶
4 years ago
I use the function below to calculate the Unix timestamp of the start of a week. It includes a boolean flag to request a GMT offset instead of the current locale setting.
<?php
function getWeekOffsetTimestamp($year, $week, $useGmt = false) {
if ($useGmt) {
// Backup timezone and set to GMT
$timezoneSettingBackup = date_default_timezone_get();
date_default_timezone_set("GMT");
}
// According to ISO-8601, January 4th is always in week 1
$halfwayTheWeek = strtotime($year."0104 +".($week - 1)." weeks");
// Subtract days to Monday
$dayOfTheWeek = date("N", $halfwayTheWeek);
$daysToSubtract = $dayOfTheWeek - 1;
// Calculate the week's timestamp
$unixTimestamp = strtotime("-$daysToSubtract day", $halfwayTheWeek);
if ($useGmt) {
// Reset timezone to backup
date_default_timezone_set($timezoneSettingBackup);
}
return $unixTimestamp;
}
?>
tkachenko_ivan at bk dot ru ¶
6 months ago
<?php
/**
* Convert a strftime format to a date format
*
* Unsupported strftime formats : %U, %W, %C, %g, %r, %R, %T, %X, %c, %D, %F, %x
* Unsupported date formats : S, n, t, L, B, G, u, e, I, P, Z, c, r
*
* @param string $strftimeFormat a strftime format
* @return string
*/
function strftimeFormatToDate($strftimeFormat) {
$caracs = array(
"%d" => "d",
"%a" => "D",
"%e" => "j",
"%A" => "l",
"%u" => "N",
"%w" => "w",
"%j" => "z",
"%V" => "W",
"%B" => "F",
"%m" => "m",
"%b" => "M",
"%G" => "o",
"%Y" => "Y",
"%y" => "y",
"%P" => "a",
"%p" => "A",
"%l" => "g",
"%I" => "h",
"%H" => "H",
"%M" => "i",
"%S" => "s",
"%z" => "O",
"%Z" => "T",
"%s" => "U",
);
return strtr((string)$strftimeFormat, $caracs);
}
$strftimeFormat = '%Y-%m-%d %H:%M:%S';
$formatDate = strftimeFormatToDate($strftimeFormat); // Y-m-d H:i:s
?>
geoffrey dot hoffman at gmail dot com ¶
3 months ago
I just wanted to emphasise that the return value of date( ) is a string, even when the result of your date format string is a number, such as "j" -> a number 1 to 31, or 'N' -> a day number 1 for Monday through 7 for Sunday... it's still returned as a string! "1" or "7" or "31". This is much more obvious on the "zero-padded" results, but it's worth repeating.
If you aren't careful, you can get stuck in a while loop comparing days of the week with something like:
<?php
// Evil! Don't use this! This will never return!
while ( date('N', $time ) !== 7 ) {
$time = $time - 86400;
}
?>
... for example. The result of date( ) should be cast to an int for numeric comparison with the exact equality operator:
<?php
// Works!
while ( (int)date('N', $time ) !== 7 ) {
$time = $time - 86400;
}
?>
Wasted an hour today on that silly mistake.
SpikeDaCruz ¶
10 years ago
The following function will return the date (on the Gregorian calendar) for Orthodox Easter (Pascha). Note that incorrect results will be returned for years less than 1601 or greater than 2399. This is because the Julian calendar (from which the Easter date is calculated) deviates from the Gregorian by one day for each century-year that is NOT a leap-year, i.e. the century is divisible by 4 but not by 10. (In the old Julian reckoning, EVERY 4th year was a leap-year.)
This algorithm was first proposed by the mathematician/physicist Gauss. Its complexity derives from the fact that the calculation is based on a combination of solar and lunar calendars.
<?php
function getOrthodoxEaster($date){
/*
Takes any Gregorian date and returns the Gregorian
date of Orthodox Easter for that year.
*/
$year = date("Y", $date);
$r1 = $year % 19;
$r2 = $year % 4;
$r3 = $year % 7;
$ra = 19 * $r1 + 16;
$r4 = $ra % 30;
$rb = 2 * $r2 + 4 * $r3 + 6 * $r4;
$r5 = $rb % 7;
$rc = $r4 + $r5;
//Orthodox Easter for this year will fall $rc days after April 3
return strtotime("3 April $year + $rc days");
}
?>
Anonymous ¶
2 years ago
To quickly convert date("N") to a 0 based index with Sunday being represented as 0, you can run it against modulus 7:
<?php
$first_of_month_index = date('N', strtotime('4/1/1990')) % 7;
?>
mel dot boyce at gmail dot com ¶
10 years ago
I've been flicking through the comments looking for some succinct date code and have noticed an alarming number of questions and over-burdened examples related to date mathematics. One of the most useful skills you can utilize when performing date math is taking full advantage of the UNIX timestamp. The UNIX timestamp was built for this kind of work.
An example of this relates to a comment made by james at bandit-dot-co-dot-en-zed. James was looking for a way to calculate the number of days which have passed since a certain date. Rather than using mktime() and a loop, James can subtract the current timestamp from the timestamp of the date in question and divide that by the number of seconds in a day:
<?php
$days = floor((time() - strtotime("01-Jan-2006"))/86400);
print("$days days have passed.\n");
?>
Another usage could find itself in a class submitted by Kyle M Hall which aids in the creation of timestamps from the recent past for use with MySQL. Rather than the looping and fine tuning of a date, Kyle can use the raw UNIX timestamps (this is untested code):
<?php
$ago = 14; // days
$timestamp = time() - ($ago * 86400);
?>
Hopefully these two examples of "UNIX-style" timestamp usage will help those finding date mathematics more elusive than it should be.
Leopietroni ¶
3 years ago
This function will add working day to a given timestamp
<?php
function addworkinday($timestamp,$daystoadd){
$dayoftheweek = date("N",$timestamp);
$sum =$dayoftheweek +$daystoadd;
while ($sum >= 6) {
$daystoadd=$daystoadd+1;
$sum=$sum-1;
}
return $timestamp +(60*60*24*$daystoadd);
}
?>
ghotinet ¶
5 years ago
Most spreadsheet programs have a rather nice little built-in function called NETWORKDAYS to calculate the number of business days (i.e. Monday-Friday, excluding holidays) between any two given dates. I couldn't find a simple way to do that in PHP, so I threw this together. It replicates the functionality of OpenOffice's NETWORKDAYS function - you give it a start date, an end date, and an array of any holidays you want skipped, and it'll tell you the number of business days (inclusive of the start and end days!) between them.
I've tested it pretty strenuously but date arithmetic is complicated and there's always the possibility I missed something, so please feel free to check my math.
The function could certainly be made much more powerful, to allow you to set different days to be ignored (e.g. "skip all Fridays and Saturdays but include Sundays") or to set up dates that should always be skipped (e.g. "skip July 4th in any year, skip the first Monday in September in any year"). But that's a project for another time.
<?php
function networkdays($s, $e, $holidays = array()) {
// If the start and end dates are given in the wrong order, flip them.
if ($s > $e)
return networkdays($e, $s, $holidays);
// Find the ISO-8601 day of the week for the two dates.
$sd = date("N", $s);
$ed = date("N", $e);
// Find the number of weeks between the dates.
$w = floor(($e - $s)/(86400*7)); # Divide the difference in the two times by seven days to get the number of weeks.
if ($ed >= $sd) { $w--; } # If the end date falls on the same day of the week or a later day of the week than the start date, subtract a week.
// Calculate net working days.
$nwd = max(6 - $sd, 0); # If the start day is Saturday or Sunday, add zero, otherewise add six minus the weekday number.
$nwd += min($ed, 5); # If the end day is Saturday or Sunday, add five, otherwise add the weekday number.
$nwd += $w * 5; # Add five days for each week in between.
// Iterate through the array of holidays. For each holiday between the start and end dates that isn't a Saturday or a Sunday, remove one day.
foreach ($holidays as $h) {
$h = strtotime($h);
if ($h > $s && $h < $e && date("N", $h) < 6)
$nwd--;
}
return $nwd;
}
$start = strtotime("1 January 2010");
$end = strtotime("13 December 2010");
// Add as many holidays as desired.
$holidays = array();
$holidays[] = "4 July 2010"; // Falls on a Sunday; doesn't affect count
$holidays[] = "6 September 2010"; // Falls on a Monday; reduces count by one
echo networkdays($start, $end, $holidays); // Returns 246
?>
Or, if you just want to know how many work days there are in any given year, here's a quick function for that one:
<?php
function workdaysinyear($y) {
$j1 = mktime(0,0,0,1,1,$y);
if (date("L", $j1)) {
if (date("N", $j1) == 6)
return 260;
elseif (date("N", $j1) == 5 or date("N", $j1) == 7)
return 261;
else
return 262;
}
else {
if (date("N", $j1) == 6 or date("N", $j1) == 7)
return 260;
else
return 261;
}
}
?>
Edward Rudd ¶
6 years ago
To actually make use ot the "u" (microsecond) you need to use the DateTime object and not the date() function.
For example
<?php
$t = microtime(true);
$micro = sprintf("%06d",($t - floor($t)) * 1000000);
$d = new DateTime( date('Y-m-d H:i:s.'.$micro,$t) );
print $d->format("Y-m-d H:i:s.u");
?>
lb at bostontech dot net ¶
6 years ago
Not sure why this got ignored the first time, but this is an even simpler way to check leap year:
<?php
function isLeapYear($year)
{ return ((($year%4==0) && ($year%100)) || $year%400==0) ? (true):(false); }
?>
frank at interactinet dot com ¶
4 years ago
If you want to compare this week with the same week last year, here is some code to get you the time at the beginning of the week. You can then add days, hours, etc to get to the day of the week that you want to know about.
<?php
$time_passed = (date('N')-1)* 24 * 3600; // time since start of week in days
$startOfWeek = mktime(0,0,0,date('m'),date('d'),date('Y')) - $time_passed;
$lastyear = $startOfWeek - 365*24*3600;
// make sure time used from last year is the same week of the year
$weekdiff = date('W') - date('W',$lastyear);
if($weekdiff != 0)
{
$lastyear = $lastyear + ($weekdiff*7*24*3600);
}
$lastyear_time_passed = (date('N',$lastyear)-1) * 24 * 3600; // time since start of week in days
$startOfWeek_lastyear = mktime(0,0,0,date('m',$lastyear),date('d',$lastyear),date('Y',$lastyear)) - $lastyear_time_passed;
?>
So now you have the unix time for the start of this week ($startOfWeek), and the start of the same week last year ($startOfWeek_lastyear).
You can convert back to datetime format easily:
<?php
echo date('Y-m-d H:i:s',$startOfWeek).'<br>';
echo date('Y-m-d H:i:s',$startOfWeek_lastyear).'<br><br>';
echo date('l F jS, Y',$startOfWeek).'<br>';
echo date('l F jS, Y',$startOfWeek_lastyear);
?>
webmaster1989 at gmail dot com ¶
3 years ago
Sometimes it is very useful to convert a sql timestamp to an also called NTP time. This is often used as time date notation in XML RSS pages. To convert a timestamp to this NTP notation try the following:
<?php
echo date('D, d M Y h:i:s O', strtotime ($timestamp);
?>
m_ocx at yahoo dot com ¶
3 years ago
Here is a cool Date class to implement the date function:
<?php
/*
* @author Gchats
*
* Date class
*/
class Date
{
private $shortDateFormat = "F j, Y";
private $longDateFormat = "F j, Y, g:i a";
private $timestamp = 0;
/**
* Default constructor
*
* @param integer $timestamp unix time stamp
*/
function __construct($timestamp = 0)
{
$this->timestamp = $timestamp;
}
/**
* Returns the given timestamp in the constructor
*
* @return integer time stamp
*/
public function getTime()
{
return (int) $this->timestamp;
}
/*
* Returns long formatted date of the given timestamp
*
* @access public
* @return string Long formatted date
*/
public function long()
{
if ( $this->timestamp > 0 )
{
return date ( $this->longDateFormat , $this->timestamp );
}
else
{
return "";
}
}
/*
* Returns short formatted date of the given timestamp
*
* @access public
* @return string Short formatted date
*/
public function short()
{
if ( $this->timestamp > 0 )
{
return date ( $this->shortDateFormat , $this->timestamp );
}
else
{
return "";
}
}
public function __toString()
{
return $this->timestamp;
}
}
?>
JonathanCross.com ¶
7 years ago
<?php
// A demonstration of the new DateTime class for those
// trying to use dates before 1970 or after 2038.
?>
<h2>PHP 2038 date bug demo (php version <?php echo phpversion(); ?>)</h1>
<div style='float:left;margin-right:3em;'>
<h3>OLD Buggy date()</h3>
<?php
$format='F j, Y';
for ( $i = 1900; $i < 2050; $i++) {
$datep = "$i-01-01";
?>
Trying: <?php echo $datep; ?> = <?php echo date($format, strtotime($datep)); ?><br>
<?php
}
?></div>
<div style='float:left;'>
<h3>NEW DateTime Class (v 5.2+)</h3><?php
for ( $i = 1900; $i < 2050; $i++) {
$datep = "$i-01-01";
$date = new DateTime($datep);
?>
Trying: <?php echo $datep; ?> = <?php echo $date->format($format); ?><br>
<?php
}
?></div>
ttt_joe_08 ¶
2 years ago
Just FYI, it's more appropriate to say "UTC", not "GMT". GMT was given up in 1972 and UTC is now the proper way. The reason being G stands for Greenwich, which naturally upset some people.
nathan ¶
4 years ago
<?php
/* the following variables are set to appropriate
characters recognized by php version 5 that
will get the date. To display the date, we have
to use 'echo' or 'print' to send the variable
data to the browser
*/
$day=date("l");
$date=date("j");
$suffix=date("S");
$month=date("F");
$year=date("Y");
echo $day . ", " . $month . " " . $date . $suffix . ", " . $year;
?>
rudimentary, simple way to due things, but it gets the job done for someone learning more on the subject.
scott at keenot dot es ¶
2 years ago
If anyone needs a really fast function for converting a datetime string (i.e. as retrieved from a MySQL DATETIME entry) into a human-friendly time output analogous to date($format, $time), here's a useful function.
<?php
function fdate($datetimestring = '1970-01-01 00:00:00', $format = 'U') {
// Create a datetime object, return it formatted
// If you want to give credit for this somewhere, thanks.
// You really don't have to though; this is kinda obvious
$dt = new DateTime($datetimestring);
return $dt->format($format);
}
?>
The main purpose of this is to reduce lines of code and allow inline coding. For example:
<?php
/* ... */
echo "This page was submitted on ".fdate($row['created'], 'F j, Y g:i:s A')." and last modified ".fdate($row['modified'], 'F j, Y g:i:s A')."<br />\n";
/* ... */
?>
Chris ¶
3 years ago
Use this to convert the local/UTC hour to the UTC/local hour:
<?php
for($utc_to_local = array(), $offset = date('Z'), $h = 0; $h < 24; $utc_to_local[] = date('G', mktime($h++)+$offset));
$local_to_utc = array_flip($utc_to_local);
echo "2 am local is ", $local_to_utc[2], " UTC";
echo "3 pm UTC is ", $utc_to_local[15], " local";
?>
This is useful when you need to do many conversions. Lookup tables are faster than calling date() and mktime() multiple times.
jc ¶
8 years ago
date("W") returns the iso8601 week number, while date("Y") returns the _current_ year. This can lead to odd results. For example today (dec 31, 2007) it returns 1 for the week and of course 2007 for the year. This is not wrong in a strict sense because iso defines this week as the first of 2008 while we still have 2007.
So, if you don't have another way to safely retrieve the year according to the iso8061 week-date - strftime("%G") doesn't work on some systems -, you should be careful when working with date("W").
For most cases strftime("%W") should be a safe replacement.
[edit: Much easier is to use "o" (lower case O) instead of "Y"]
Anonymous ¶
3 years ago
To find last sunday for given date
<?php
$day = '2012-10-04';
echo 'last sunday : '.date("Y-m-d",strtotime($day." last Sunday "));
?>
output:
last sunday : 2012-09-30
Anon ¶
3 years ago
I needed to convet a duration timestamp into H:i:s but whenever I did it kept bringing 5 back as 01:00:05 (due to some DST stuff) so I made this function to replace date(). It has no optimisations but hopefully someone might find it useful:
<?php
function get_time_string(){
$time = 3600+(60*32)+(50); // 01:32:50
$time_string = '';
$hours = (int)($time/(60*60));
if(strlen($hours) > 1){
$time_string = $hours.':';
}else{
$time_string = '0'.$hours.':';
}
$minutes = (int)(($time%(60*60))/(60));
if($minutes >= 1){
if(strlen($minutes) > 1){
$time_string .= $minutes.':';
}else{
$time_string .= '0'.$minutes.':';
}
$seconds = ($time%(60*60))%(60);
if(strlen($seconds) > 1){
$time_string .= $seconds;
}else{
$time_string .= '0'.$seconds;
}
}else{
if(strlen($time) > 1){
$time_string .= '00:'.$time;
}else{
$time_string .= '00:0'.$time;
}
}
return $time_string;
}
?>
stokestack at gmail dot com ¶
3 years ago
If you want to find your server's timezone offset from GMT, it seems as though you could just do:
date('Z')
to get the number of seconds offset. But PHP requires that you call date_default_timezone_set(). So if you have to hard-code a timezone, why not simply hard-code a variable that tells you the offset from GMT? If you set the timezone to GMT, the dates in your database will still be in local time, but time('Z') will return zero.
To keep your code portable across servers in different timezones, you can do this:
date_default_timezone_set(date_default_timezone_get())
This keeps PHP from complaining that you haven't called date_default_timezone_set(), but makes your code portable. Ridiculous.
Anonymous ¶
2 years ago
Was trying to compare dates when I noticed that:
<?php
var_dump(date('d.m.Y', null));//string(10) "01.01.1970"
var_dump(date('d.m.Y', ''));//bool(false)
?>
Thought it's worth mentioning. Caused some weird logs to be produced in our system since this does not evaluate to the same.
sanket at webvice dot co dot uk ¶
8 months ago
<?
/**
* This function gives you the next working days based on the buffer
*
* @param $date must be in YYYY-MM-DD format
* @param int $buffer
* @param string $holidays - You can pass either an array of holidays in YYYYYMMDD format or a URL for a .ics file
* containing holidays this defaults to the UK govt holiday data for England and Wales
* @return string
*/
function getWorkingDays($date,$buffer=1,$holidays='') {
if ($holidays==='') $holidays = 'https://www.gov.uk/bank-holidays/england-and-wales.ics';
if (!is_array($holidays)) {
$ch = curl_init($holidays);
curl_setopt($ch,CURLOPT_RETURNTRANSFER,true);
$ics = curl_exec($ch);
curl_close($ch);
$ics = explode("\n",$ics);
$ics = preg_grep('/^DTSTART;/',$ics);
$holidays = preg_replace('/^DTSTART;VALUE=DATE:(\\d{4})(\\d{2})(\\d{2}).*/s','$1-$2-$3',$ics);
}
$addDay = 0;
while ($buffer--) {
while (true) {
$addDay++;
$newDate = date('Y-m-d', strtotime("$date +$addDay Days"));
$newDayOfWeek = date('w', strtotime($newDate));
if ( $newDayOfWeek>0 && $newDayOfWeek<6 && !in_array($newDate,$holidays)) break;
}
}
return $newDate;
}
?>
jock ¶
1 year ago
As of PHP 5.3.3, date('c') will produce a string like this:
2014-06-17T16:22:42+02:00
Instead date (DATE_ISO8601) will produce:
2014-06-17T16:23:36+0200
which lacks the semicolon in the timezone part. Both are ISO8601 compliant anyway, but I found that the latter has better compatibility with other languages like python.
david dot leon at gmx dot com ¶
1 year ago
<?php
//date returns microseconds.
function mdate($format, $microtime = null) {
$microtime = explode(' ', ($microtime ? $microtime : microtime()));
if (count($microtime) != 2) return false;
$microtime[0] = $microtime[0] * 1000000;
$format = str_replace('u', $microtime[0], $format);
return date($format, $microtime[1]);
}
?>
echo mdate('Y-m-d H:i:s.u');
2014-05-19 12:41:59.202303
lehal2 at hotmail dot com ¶
3 years ago
here is an example how you can make numeric days of the week from 1 to 7(Monday to Friday)
<?php
$currentdate = mktime(0, 0, 0, date("m") , date("d"), date("Y"));
echo $day_eg1 = date ('N',$currentdate);
echo $day_eg2 = date("N", $today+1 * 24 * 3600);
echo $day_eg3= date("N", $today+2 * 24 * 3600);
echo $day_eg4 = date("N", $today+3 * 24 * 3600);
echo $day_eg5 = date("N", $today+4 * 24 * 3600);
echo $day_eg6 = date("N", $today+5 * 24 * 3600);
echo $day_eg7 = date("N", $today+6 * 24 * 3600);
?>
blinov vyacheslav AT gmail.com ¶
4 years ago
It was oblivious and discouraging that it dont mentioned in docs. If you will use W to get week number be aware:
first days of year can be in a week of previous year, and week number always has leading zero
<?php
echo date("YW", strtotime("2011-01-07")); // gives 201101
echo date("YW", strtotime("2011-01-01")); // gives 201152
echo date("YW", strtotime("2011-12-31")); // gives 201152 too
?>
so you can`t rely on number of week given from this function inside your program if you want to use it for some logic
chubby at chicks dot com ¶
7 years ago
<?php
/**
* Checks wether a date is between an interval
*
* Usage:
*
* // check if today is older than 2008/12/31
* var_dump(currentDayIsInInterval('2008/12/31'));
* // check if today is younger than 2008/12/31
* var_dump(currentDayIsInInterval(null,'2008/12/31'));
* // check if today is between 2008/12/01 and 2008/12/31
* var_dump(currentDayIsInInterval('2008/12/01','2008/12/31'));
*
* Will trigger errors if date is in wrong format, notices if $begin > $end
*
* @param string $begin Date string as YYYY/mm/dd
* @param string $end Date string as YYYY/mm/dd
* @return bool
*/
function currentDayIsInInterval($begin = '',$end = '')
{
$preg_exp = '"[0-9][0-9][0-9][0-9]/[0-9][0-9]/[0-9][0-9]"';
$preg_error = 'Wrong parameter passed to function '.__FUNCTION__.' : Invalide date
format. Please use YYYY/mm/dd.';
$interval_error = 'First parameter in '.__FUNCTION__.' should be smaller than
second.';
if(empty($begin))
{
$begin = 0;
}
else
{
if(preg_match($preg_exp,$begin))
{
$begin = (int)str_replace('/','',$begin);
}
else
{
trigger_error($preg_error,E_USER_ERROR);
}
}
if(empty($end))
{
$end = 99999999;
}
else
{
if(preg_match($preg_exp,$end))
{
$end = (int)str_replace('/','',$end);
}
else
{
trigger_error($preg_error,E_USER_ERROR);
}
}
if($end < $begin)
{
trigger_error($interval_error,E_USER_WARNING);
}
$time = time();
$now = (int)(date('Y',$time).date('m',$time).date('j',$time));
if($now > $end or $now < $begin)
{
return false;
}
return true;
}
?>
Jacques Marais ¶
2 years ago
If you want to print something like: Tuesday, the 14th of January, 2014
Use this:
<?php
echo date("l", strtotime("now")).', the'.date(" jS", strtotime("now")).' of'.date(" F, Y", strtotime("now"));
?>
This is because you cannot use words in the date string. If you use words in the date string it will be seen as a format character
So if you use:
<?php
echo date("l, the jS of F, Y", strtotime("now"));
?>
It will print something like: Tuesday, 3108Europe/Berlin 14th 2014f January, 2014
Ryan ¶
1 year ago
That is just too hard anyone have it easier terms for a lad who only has internet for 5 mis a day cause he has to walk his pet peanut
matt ¶
4 years ago
date() has some strange behavior at extremely high values:
<?php
echo "9223372036854775805: " . date("Y-m-d g:i:s a", 9223372036854775805) . "\n";
echo "9223372036854775806: " . date("Y-m-d g:i:s a", 9223372036854775806) . "\n";
echo "9223372036854775807: " . date("Y-m-d g:i:s a", 9223372036854775807) . " (0x7FFFFFFFFFFFFFFF)\n";
echo "9223372036854775808: " . date("Y-m-d g:i:s a", 9223372036854775808) . "\n";
echo "9223372036854775809: " . date("Y-m-d g:i:s a", 9223372036854775809) . "\n";
echo "9223372036854775810: " . date("Y-m-d g:i:s a", 9223372036854775810) . "\n";
echo "...\n";
echo "9223372036854776832: " . date("Y-m-d g:i:s a", 9223372036854776832) . "\n";
echo "9223372036854776833: " . date("Y-m-d g:i:s a", 9223372036854776833) . "\n";
echo "...\n";
echo "9223372036854778879: " . date("Y-m-d g:i:s a", 9223372036854778879) . "\n";
echo "9223372036854778880: " . date("Y-m-d g:i:s a", 9223372036854778880) . "\n";
echo "...\n";
echo "9223372036854780928: " . date("Y-m-d g:i:s a", 9223372036854780928) . "\n";
echo "9223372036854780929: " . date("Y-m-d g:i:s a", 9223372036854780929) . "\n";
echo "...\n";
echo "9223372036854782975: " . date("Y-m-d g:i:s a", 9223372036854782975) . "\n";
echo "9223372036854782976: " . date("Y-m-d g:i:s a", 9223372036854782976) . "\n";
echo "...\n";
echo "9223372036854785024: " . date("Y-m-d g:i:s a", 9223372036854785024) . "\n";
echo "9223372036854785025: " . date("Y-m-d g:i:s a", 9223372036854785025) . "\n";
echo "...\n";
echo "9223372036854787071: " . date("Y-m-d g:i:s a", 9223372036854787071) . "\n";
echo "9223372036854787072: " . date("Y-m-d g:i:s a", 9223372036854787072) . "\n";
echo "...\n";
echo "9223372036854789120: " . date("Y-m-d g:i:s a", 9223372036854789120) . "\n";
echo "9223372036854789121: " . date("Y-m-d g:i:s a", 9223372036854789121) . "\n";
echo "...\n";
echo "9223372036854791167: " . date("Y-m-d g:i:s a", 9223372036854791167) . "\n";
echo "9223372036854791168: " . date("Y-m-d g:i:s a", 9223372036854791168) . "\n";
echo "...\n";
echo "9223372036854793215: " . date("Y-m-d g:i:s a", 9223372036854793215) . "\n";
echo "9223372036854793216: " . date("Y-m-d g:i:s a", 9223372036854793216) . "\n";
echo "9223372036854793217: " . date("Y-m-d g:i:s a", 9223372036854793217) . "\n";
echo "9223372036854793218: " . date("Y-m-d g:i:s a", 9223372036854793218) . "\n";
?>
Output:
9223372036854775805: 292277026596-12-04 10:30:05 am
9223372036854775806: 292277026596-12-04 10:30:06 am
9223372036854775807: 292277026596-12-04 10:30:07 am (0x7FFFFFFFFFFFFFFF)
9223372036854775808: 292277026596-12-04 10:30:08 am
9223372036854775809: 292277026596-12-04 10:30:08 am
9223372036854775810: 292277026596-12-04 10:30:08 am
...
9223372036854778879: 292277026596-12-04 10:30:08 am
9223372036854778880: 292277026596-12-04 11:04:16 am
...
9223372036854778879: 292277026596-12-04 11:04:16 am
9223372036854778880: 292277026596-12-04 11:38:24 am
...
9223372036854780928: 292277026596-12-04 11:38:24 am
9223372036854780929: 292277026596-12-04 12:12:32 pm
...
9223372036854782975: 292277026596-12-04 12:12:32 pm
9223372036854782976: 292277026596-12-04 12:46:40 pm
...
9223372036854785024: 292277026596-12-04 12:46:40 pm
9223372036854785025: 292277026596-12-04 1:20:48 pm
...
9223372036854787071: 292277026596-12-04 1:20:48 pm
9223372036854787072: 292277026596-12-04 1:54:56 pm
...
9223372036854789120: 292277026596-12-04 1:54:56 pm
9223372036854789121: 292277026596-12-04 2:29:04 pm
...
9223372036854791167: 292277026596-12-04 2:29:04 pm
9223372036854791168: 292277026596-12-04 3:03:12 pm
...
9223372036854793215: 292277026596-12-04 3:03:12 pm
9223372036854793216: 292277026596-12-04 3:03:12 pm
9223372036854793217: -292277022657-01-27 8:37:04 am
9223372036854793218: -292277022657-01-27 8:37:04 am
---
So, the last reliable unix timecode is 9223372036854775808 (0x1000000000000000). Not that you would probably ever need a date that high.
Manu Manjunath ¶
2 years ago
If you want to use "u" format specifier for micrseconds without changing to DateTime object, you may write a function as below:
<?php
/**
* Quick replacement to date() function to handle the 'u' format specifier (for microseconds)
* @param string $format Date format string - the same format string you would pass to date() function
* @param float $timestamp [optional] Unix timestamp with microseconds - Typically output of <b>microtime(true)</b>
* @return string Formatted string
*/
function date_with_micro($format, $timestamp = null) {
if (is_null($timestamp) || $timestamp === false) {
$timestamp = microtime(true);
}
$timestamp_int = (int) floor($timestamp);
$microseconds = (int) round(($timestamp - floor($timestamp)) * 1000000.0, 0);
$format_with_micro = str_replace("u", $microseconds, $format);
return date($format_with_micro, $timestamp_int);
}
?>
You can safely replace your date() function with date_with_micro().
krejci dot info at seznam dot cz ¶
8 months ago
I recommend to use "/" instead of "-" when creating dates:
<?
if( date( 'd/m' ) >= date_create( '01/09' ) ) { }
?>
akshayinbox at gmail dot com ¶
8 months ago
When using date(), be sure to "double-escape" certain characters, for example, if printing the word "at", double escape "t" otherwise it will be treated as "tab" simply leading to a space being inserted.
Example:
<?php echo "Last updated ".date("M j<\s\u\p>S</\s\u\p\>, Y \a\\t h:i A"); ?>
will output
Last updated Aug 23rd 2015 at 2:47 PM
(assuming today is Aug 23rd 2015 and it is 2:47 PM)
