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

; =================================================================
;  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