round time DOWN to nearest 15 mins

Hello,

How can I round a time down to the nearest 15 minutes ?

this is what im kind thiking but it dosent work


ResTime = ResTime.Date.AddMinutes(-(DatePart(DateInterval.Minute, ResTime) Mod 15))

Thanks

Rob
Rob_2002Asked:
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PaulHewsCommented:
Option Explicit

Private Sub Command1_Click()
    Debug.Print fRoundTime15(#1:59:59 PM#)
End Sub

Public Function fRoundTime15(dtTime As Date) As Date
    Dim intHour As Integer
    Dim intMin As Integer
    Dim i As Integer
   
    intHour = Hour(dtTime)
    intMin = Minute(dtTime)
    For i = 0 To 60 Step 15
        If i > intMin Then
            intMin = i - 15
            Exit For
        End If
    Next i
    fRoundTime15 = TimeSerial(intHour, intMin, 0)
End Function
0
DocMCommented:
Public Function RoundToNearest15Min(dtTime As Date) As Date
   Dim intHour As Integer
   Dim intMin As Integer
   Dim i As Integer
   
   intHour = Hour(dtTime)
   intMin = Minute(dtTime)
   
   memdiff = 61
   For i = 0 To 60 Step 15
     'Use Abs() function to get the nearest
      If Abs(intMin - (i)) < memdiff Then
       memdiff = Abs(intMin - (i)): RoundedMin = i
      End If
   Next i
   RoundToNearest15Min = TimeSerial(intHour, RoundedMin, 0)
End Function

Private Sub Command1_Click()
 
Dim dtTime As Date
 
dtTime = #1:46:59 PM#
Debug.Print RoundToNearest15Min(dtTime)

dtTime = #1:58:59 PM#
Debug.Print RoundToNearest15Min(dtTime)

End Sub


0
phildaleyCommented:
Private Function RoundTime(ByVal dtTime As Date) As Date
    Dim lMins As Long
    Dim lSecs As Long
   
    lMins = CLng(Format(dtTime, "nn")) Mod 15
    lSecs = CLng(Format(dtTime, "ss"))
    dtTime = DateAdd("n", -lMins, dtTime)
    RoundTime = DateAdd("s", -lSecs, dtTime)
End Function
0
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phildaleyCommented:
Just after my last submission, I realised you could also do:

Private Function RoundTime(ByVal dtTime As Date) As Date
    Dim lMins As Long
    Dim lSecs As Long
   
    lMins = DatePart("n", dtTime) Mod 15
    lSecs = DatePart("s", dtTime)
    dtTime = DateAdd("n", -lMins, dtTime)
    RoundTime = DateAdd("s", -lSecs, dtTime)
End Function
0

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Rob_2002Author Commented:
cheers mate !!
0
PaulHewsCommented:
Nice solution.
0
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