Android Question Need help with unusual countdown timer please (SOLVED)


Licensed User
I have been playing around with DateUtils, but can't quite work out how to do this one.

The local trains leave every 15 minutes during the day.
E.g. the train to one town (Fremantle) leaves on the hour, then 15, 30 and 45 minutes past.
The train to another town leaves at 3 mins past, then 18, 33, 48
and so one.

So taking Fremantle as an example, at any time I want to simply display the number of minutes and seconds to the next train departure.
Any advice gratefully accepted.


Well-Known Member
Licensed User
Sub secondsLeftUntilQuarterHour(when As Long) As Long
    Return (15*60*1000-(when mod (15*60*1000)))/1000
End Sub
This sub will give you the number of seconds left until the next quarter hour interval. From there, you can parse that into minutes and seconds using simple arithmetic.
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Licensed User
It worked perfectly, thank you.
Here is the resultant code with two trains. I just have to pass the time (in minutes) of the first train in the hour.

Sub Process_Globals
Dim Mins As Int
Dim secs As Long
Dim Rsecs As String
End Sub

Sub Globals
   Private lblClockFaceL As Label
   Private lblClockFaceP As Label
   Dim NowDay As Long     
   Dim CurrentTime As Long
End Sub

Sub Activity_Create(FirstTime As Boolean)

   NowDay = DateTime.DateParse(DateTime.Date(DateTime.Now))
   CurrentTime = DateTime.Now - NowDay
   lblClockFaceP.Text = TimeLeft(CurrentTime,0) 'train from Perth to City West - first train leaves on the hour
   lblClockFaceL.Text = TimeLeft(CurrentTime,6) 'train from City West to Perth - first train leaves at 6 minutes past the hour
End Sub
Sub TimeLeft(when As Long, FirstTrain As Int) As String
   If FirstTrain > 0 Then FirstTrain = FirstTrain * 60000
   secs = (15*60*1000-((when-FirstTrain) mod (15*60*1000)))/1000
   Mins = secs/60 : Rsecs = "0" & (secs - Mins*60)
   Return Mins & ":" & Rsecs.SubString(Rsecs.Length - 2)
End Sub

Sub Activity_Resume
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