by Andy Henderson (4 Submissions)
Category: Math/Dates
Compatability: VB 6.0
Difficulty: Unknown Difficulty
Originally Published: Sun 4th July 2010
Date Added: Mon 8th February 2021
Rating: 
(1 Votes)
Returns the time offset for the current daylight saving. Ths is set to UK time so the dates and offset are for GMT/BST - they are clearly
API Declarations
Add it to a handy module
VBcoders
Dim qd As Date
Select Case DatePart("m", dt)
Case 4, 5, 6, 7, 8, 9
GMTOffSet = 1 ' april to september = BST
Case 1, 2, 11, 12
GMTOffSet = 0: Exit Function ' November to February = GMT
Case 3
qd = "31/03/" & DatePart("YYYY", dt)
For n = 0 To 6 ' find last sunday in march
If DatePart("w", qd) = vbSunday Then Exit For ' got our last sunday in the month
qd = DateAdd("d", -1, qd)
Next
GMTOffSet = Sgn(1 + Sgn(DateDiff("d", qd, dt)))
Case 10
qd = "31/10/" & DatePart("YYYY", dt)
For n = 0 To 6 ' find last sunday in march
If DatePart("w", qd) = vbSunday Then Exit For ' got our last sunday in the month
qd = DateAdd("d", -1, qd)
Next
If Sgn(1 + Sgn(DateDiff("d", qd, dt))) = 1 Then
GMTOffSet = 0
Else
GMTOffSet = 1
End If
End Select
End Function
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