Android Question StartServiceAt problem

Sub Service_Start (StartingIntent As Intent)
    StartServiceAt(Me, NextTimeInstance(17, 27) ,True)
    StartActivity(Main)

End Sub

Sub NextTimeInstance (Hours As Int, Minutes As Int) As Long
    Dim today As Long = DateTime.Now
    today = DateUtils.SetDateAndTime(DateTime.GetYear(today), DateTime.GetMonth(today), _
     DateTime.GetDayOfMonth(today), Hours, Minutes, 0)
    If today < DateTime.Now Then
        Dim p As Period
        p.Days = 1
        Dim tomorrow As Long = DateUtils.AddPeriod(today, p)
        Return tomorrow
    Else
        Return today
    End If
End Sub