%SubTimesLocal function

Function

The function deducts absolute time TimeB from absolute time TimeA. The result is value of Relative time type.

Declaration

REAL %SubTimesLocal(
   TIME in TimeA,
   TIME in TimeB,
   TEXT in timeZone := %GetCurrentTimeZone()
 )

Parameters

TimeA	Absolute time.
TimeB	Absolute time.
timeZone

Description

The function %SubTimesLocal deducts one absolute time from another one. The result will not be influenced by the fact if the time offset was or was not in this interval. For example, the difference between 4:00 and 1:00 a.m. is always three hours.

Example

; =================================================================
;  Using time zone "Europe/Bratislava"
;  Daylight saving time was observed in year 2009, therefore time shifts occured.
;  Winter [B] time was 1 hour ahead of UTC, summer [A] time was 2 hours ahead of UTC.
;  Summer time was from 29th March 2009 to 24th October 2009.
;  A3:00:00 is changed to B2:00:00 on Sunday (25th October 2009).
; =================================================================
 
BEGIN
  TIME _timeA
  TIME _timeB
  TIME _baseTime

  REAL _subLocal1
  REAL _subLocal2

  ; 2009-10-25 00:30:00 UTC
  _timeA := %StrToTimeEx("2009-10-25 A2:30:00", "yyyy-mm-dd hh:mi:ss", "Europe/Bratislava")
  ; 2009-10-25 01:30:00 UTC
  _timeB := %StrToTimeEx("2009-10-25 B2:30:00", "yyyy-mm-dd hh:mi:ss", "Europe/Bratislava")
  ; 2009-10-24 23:30:00 UTC
  _baseTime := %StrToTimeEx("2009-10-25 01:30:00", "yyyy-mm-dd hh:mi:ss", "Europe/Bratislava")
 
  ; difference 1 hour(s) (3600 seconds)
  _subLocal1 := %SubTimesLocal(_timeA, _baseTime, "Europe/Bratislava")
  ; difference 1 hour(s) (3600 seconds)
  _subLocal2 := %SubTimesLocal(_timeB, _baseTime, "Europe/Bratislava")
 
 END

Related pages: