AbsoluteTime

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AbsoluteTime[]

gives the local time in seconds since epoch 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 for a given date string.

AbsoluteTime[{"string",{$e_1$, $e_2$, ...}}]

takgs the date string to contain the elements "ei".

$TimeZone
AbsoluteTiming