Further to the above, because the masked edit controls don’t inherently know anything about what the data they collect represents, you need to write your own validation code. Here’s a simple example to get you started.

Sub Main(Client, GWEvent)
  Dlg.rzMaskEditTime.editmask = "!90:00;1;_"
  Dlg.showmodal
End Sub

' Validate the time when OK button pressed
sub btnOkClick(Sender)
  dim iPos
  dim iHour
  dim iMinutes

  iPos = instr(1, Dlg.rzMaskEditTime.text, ":", vbTextCompare)

  ' Make sure we have the seperator character exists
  if (iPos = 0) then
    exit sub
  end if

  ' Get the hour portion from the value
  iHour = trim(mid(Dlg.rzMaskEditTime.text, 1, iPos-1))

  ' Exit if the hour value not entered
  if (len(iHour) = 0) then
    msgbox("Enter hour.")
    exit sub
  end if

  iHour = cint(iHour)

  ' Exit, if the hour not in the valid range
  if (iHour >= 24) then
    msgbox("Enter valid hour.")
    exit sub
  end if

  ' Get the minute portion from the value
  iMinutes = trim(mid(Dlg.rzMaskEditTime.text, iPos + 1))

  ' Exit if the minute value not entered
  if (len(iMinutes) = 0) then
    msgbox("Enter minute.")
    exit sub
  end if

  iMinutes = cint(iMinutes)

  ' Exit, if the minute not in the valid range
  if (iMinutes >= 60) then
    msgbox("Enter valid minutes.")
    exit sub
  end if

  msgbox "Time entered: " & TimeSerial(iHour, iMinutes, 0)
End Sub

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