extract times in ms access

Posted on 2014-12-16
Last Modified: 2014-12-17
I have textboxes that has times entered in this format 18 Hours 10 Minutes
i would like to extract the hours and minutes then have the sum of text boes displayed in another box.
Question by:Svgmassive
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LVL 18

Expert Comment

ID: 40503085
Please provide a few more examples of the time format.
Could it also be 234 hours 5 minutes (>24 hours, hours or minutes without the leading zero)?
could it also be 0 hours 0 minutes?
could it also be 15 hours (whole number of hours, so no minutes specified)
Is there any validation on the text box or could the values also include typos?
LVL 120

Assisted Solution

by:Rey Obrero (Capricorn1)
Rey Obrero (Capricorn1) earned 250 total points
ID: 40503099
try this sample db

click Process button

you can also change the values the is on display on the three  top textboxes then click process button

result is displayed on the 4th textbox
LVL 18

Expert Comment

ID: 40503119
Nice one Rey! I didn't know val() could be used like that (to get a numeric value from a string that starts with a number).
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LVL 37

Expert Comment

ID: 40503294
Val() only pulls out the first numeric string so it won't help you in this case since you have two embedded strings.  Of course, you could use two fields that are defined as numeric rather than a mushed text string and not have this problem at all.
LVL 120

Expert Comment

by:Rey Obrero (Capricorn1)
ID: 40503314
<Val() only pulls out the first numeric string so it won't help you in this case since you have two embedded strings. >

it will help, if you know how to use them.
LVL 18

Expert Comment

ID: 40503647
Yes, I tried Rey's solution and it works - otherwise I wouldn't have congratulated him. Good use of both Val() and Split().

The only fail I got was if I entered 1 hour 5 minutes (without the 's' on the hours). I agree with Pat that a better way to enter the data would be as separate numeric fields for hours and minutes, or a single hh:mm format datetime field with validation, but given the question as stated I think Rey's solution is ace.
LVL 37

Expert Comment

ID: 40503719
As long as you're happy.  I would have simply split the field and not used Val at all.  I've been burned by it on more than one occasion.  This one seems safe enough although you should be aware that certain very strange expressesions are considered to be numeric by Val() such as

print val("1e3.2")

Looks like val is interpreting this as scientific notation.  I discovered the issue in an application that managed drawings for a building company and then again in an application that worked with part numbers.
LVL 18

Expert Comment

ID: 40503730
Thanks for the salutory warning on Val(). I don't think I've ever used it myself, but I was interested to see it in Rey's code.
LVL 50

Accepted Solution

Gustav Brock earned 250 total points
ID: 40504243
> The only fail I got was if I entered 1 hour 5 minutes (without the 's' on the hours).
And so will 1 minute fail.

You'll have to validate the content of the textboxes. Then it is a bit simpler to convert to time values and sum these. Finally, apply a generice function to format the sum like the one below; you can, of course, modify it to return any format.
Private Sub Command8_Click()

    Me.Text4 = FormatHourMinute(fComputeTime())

End Sub

Private Sub Form_Load()

Me.Text1 = "18 hours 10 minutes"
Me.Text2 = "1 hour 10 minutes"
Me.Text3 = "18 hours 1 minute"

End Sub

Private Function fComputeTime() As Date

    Dim ctl     As Control
    Dim datTime As Date

    For Each ctl In Me.Controls
        If ctl.ControlType = acTextBox Then
            If InStr(ctl.Value, "hour") > 0 And InStr(ctl.Value, "minute") > 0 Then
                datTime = datTime + TimeSerial(CLng(Split(ctl.Value, " ")(0)), CLng(Split(ctl.Value, " ")(2)), 0)
            End If
        End If

    fComputeTime = datTime

End Function

Public Function FormatHourMinute( _
  ByVal datTime As Date, _
  Optional ByVal strSeparator As String = ":") _
  As String
' Returns count of days, hours and minutes of datTime
' converted to hours and minutes as a formatted string
' with an optional choice of time separator.
' Example:
'   datTime: #10:03# + #20:01#
'   returns: 30:04
' 2005-02-05. Cactus Data ApS, CPH.

  Dim strHour       As String
  Dim strMinute     As String
  Dim strHourMinute As String
  strHour = CStr(Fix(datTime) * 24 + Hour(datTime))
  ' Add leading zero to minute count when needed.
  strMinute = Right("0" & CStr(Minute(datTime)), 2)
  strHourMinute = strHour & strSeparator & strMinute
  FormatHourMinute = strHourMinute
End Function

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Author Comment

ID: 40504480
gustav you are correct thanks
LVL 50

Expert Comment

by:Gustav Brock
ID: 40504496
You are welcome!


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