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Using System Time

Posted on 1999-06-29
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Last Modified: 2010-05-02
I created a clock application identical to the one in the MSDN help system example.
I also created a public variant variable called AlarmTime in the subroutine for the timer as seen below I have it check to see if the AlarmTime is less then Time or if it is not equal to 0. "0" is what the variable is set to if no alarm time is entered into a masked edit box on the form.
Play_Sound is a sub that calls a WIN32.API function for the alarm sound.

The whole thing works perfect as long as the AlarmTime variable is not above 09:59:59 AM, after that it plays as soon as you set the alarm, it would seem that it thinks 10:00:00 AM is < then 9:00:00 AM. I thought the system time was the number of seconds since midnight. How do I fix the sub below?

Private Sub Timer1_Timer()
If lblTime.Caption <> CStr(Time) Then
    lblTime.Caption = Time
    If AlarmTime < CStr(Time) And AlarmTime <> 0 Then
        Play_Sound
    End If
End If
End Sub
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Question by:timothy1
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mdougan earned 200 total points
ID: 1520658
You should not be comparing the string version of the time values, you should convert the alarmtime to a date using the CDate function, then you should use Now() to get the current Date/Time, then you should do a DateDiff call to see if the current Date/Time is greater than the Alarm time.  This will also work if the Alarm time is 11:59 PM and the current time is 12 midnight (because you have the dates and the times)  Speakin of which, you should prompt your user to enter a date for the alarm or take the current date as a default.

if sDate is the alarm date and sTime is the alarm time:

        vTime = Format(Now(), "mm/dd/yyyy hh:nn:ss AM/PM")
        vDiff = DateDiff("s", vTime, sDate & " " & sTime)
        If (vDiff < 1) Then

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by:mdougan
ID: 1520659
Actually, in the example I gave, I didn't convert the "alarm time" into a date using CDate, I just concatenated a string of date in the format of mm/dd/yyyy with a space and then with a string of time in the format of hh:nn:ss AM/PM.
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by:timothy1
ID: 1520660
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