[Overview][Constants][Procedures and functions][Index] Reference for unit 'dateutils' (#rtl)


Convert local time to UTC time


Source position: dateutil.inc line 431

function LocalTimeToUniversal(

  LT: TDateTime


function LocalTimeToUniversal(

  LT: TDateTime;

  TZOffset: Integer



UniversalTimeToLocal converts a local time indication to a universal time indication: it undoes the TZOffset timezone offset from the UT Universal time (UTC). If no TZOffset is specified, the local time offset as returned by GetLocalTimeOffset is used.

Note that for times in the past or in the future, or for time zones with DST, omitting the TZoffset may lead to wrong results, as the current timezone offset is used. Calculation of the correct timezone offset for a given date is very complicated, and outside the scope of this call.

See also




Convert UTC time to local time

Documentation generated on: Mar 17 2017