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BUILT-IN MATHEMATICA SYMBOL
AbsoluteTime
AbsoluteTime[]
gives the total number of seconds since the beginning of January 1, 1900, in your time zone.
AbsoluteTime[{y, m, d, h, m, s}]
gives the absolute time specification corresponding to a date list.
AbsoluteTime["string"]
gives the absolute time specification corresponding to a date string.
AbsoluteTime[{"string", {"e1", "e2", ...}}]
takes the date string to contain the elements 
.
Details and Options
- AbsoluteTime[] uses whatever date and time have been set on your computer system. It performs no corrections for time zones, daylight saving time, etc.
- AbsoluteTime[TimeZone -> z] gives the date and time inferred for time zone z by assuming that your computer is set for the time zone specified by $TimeZone. »
- AbsoluteTime[] is always accurate down to a granularity of $TimeUnit seconds, but on many systems is much more accurate.
- Shorter lists can be used in AbsoluteTime[{y, m, ...}]: {y} is equivalent to
, 
to 
, etc. - Values of m, d, h, m, s outside their normal ranges are appropriately reduced. Noninteger values of d, h, m, s can also be used. »
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