检查第一时间选择器是否早于第二时间选择器

Question

I have 2 timepicker which represent start and finish. It means the start time must be earlier than the finish.

My idea is to use Calendar class and use getTimeInMillis to do the validation, but its not working :

            Calendar calFrom = Calendar.getInstance();
            Calendar calTo = Calendar.getInstance();

            calFrom.set(Calendar.HOUR_OF_DAY, timeSchedule.getCurrentHour());
            calFrom.set(Calendar.MINUTE, timeSchedule.getCurrentMinute());
            calTo.set(Calendar.HOUR_OF_DAY, toTime.getCurrentHour());
            calTo.set(Calendar.MINUTE, toTime.getCurrentMinute());

            if(calFrom.getTimeInMillis() > calTo.getTimeInMillis())
            {
                Crouton.makeText(MyActivity.this, "error", Style.ALERT).show();
            }

When i debug the above code, although the timeSchedule is earlier then toTime , the value of calFrom.getTimeInMillis() is bigger than calTo.getTimeInMillis() .

Please kindly help me, Thanks for your time.

Answer 1

int fromHour = calFrom.getCurrentHour();
int toHour = calTo.getCurrentHour();
int fromMin = calFrom.getCurrentMinute();
int toMin= calTo.getCurrentMinute();

if (fromHour >toHour )
{
        System.out.println ("from time is greater");
}
else if (fromHour==toHour)
{
     if (fromMin>toMin)
     {
          System.out.println ("from time is greater");
     }
     else
     {
         System.out.println ("To time is greater");
      }
}
else
{
     System.out.println ("To time is greater");
}