Re:How to save datetimes for future events
by arielby on Monday March 23, 2015 @06:38PM
(#9253774)
UTC just provides a labeling for TAI/TT seconds, so a count-of-UTC-seconds timestamp is identical to a count-of-TAI-seconds timestamp (assuming the same epoch). Both are different from a count-of-non-leap-UTC-seconds aka POSIX time.
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You cannot know for sure how many leap seconds there will be in for instance the next 5 years. So you cannot know for sure exactly how many seconds there will elapse from now until for instance July 1st 2020 midnight UTC.