AbsoluteTime

AbsoluteTime[]
gives the local time in seconds since epoch Jan 1 1900.
AbsoluteTime[string]
gives the absolute time specification for a given date string.
AbsoluteTime[{ymdhms}]
gives the absolute time specification for a given date list.
AbsoluteTime[{“string”,{e1e2, ...}}]
gives the absolute time specification for a given date list with specified elements ei.