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Name of affected component: Core Reporting API

Name of related library and version, if applicable (e.g. Java, Python,
HTTP, Objective-C, etc.):

Issue summary:

It would be a great feature to have the ability to pull the unix timestamp rather than multiple dimensions. Further, the ability to get the granular levels of reporting at the second mark make for a more detailed analysis both from a debugging perspective, as well as opening up broader analysis techniques utilising the true time stamp

Steps to reproduce issue:
1. no steps to reproduce, the feature does not exist in the date dimensions fields in the reporting API

Expected output:
I would love to see the following as an option in the Reporting API
ga:timestamp

Actual results:
Nothing. it doesnt exist. currently have to write an event that sets this value or pull out 4 dimension just to get it to the minute level. 
ga:date, ga:day, ga:hour, ga:minute is cumbersome given this needs to be joined then data subset based on time specific conditions that are to be met.

Notes:
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