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Posted on 1998-11-22
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Last Modified: 2010-03-30
I need to compare two values: finish time and start time which gotten from text fields in my program.  I tried to use codes:
1).  if (txtfinishTime.getText() <= txtstartTime.getText())
            return true
      elase
           return false;

 
2).  SimpleDateFormat formatter = new SimpleDateFormat("hh:mm:ss");
  long ET = formatter.parse(txtfinishTime.getText()).getTime();
  long ST = formatter.parse(txtstartTime.getText()).getTime();
 if(ET <= ST)
     return true;
 else
   return false;

Both 1) and 2) are wrong. For 2). If I enter any time from 12:00:00 to 12:59:59 in the text field txtfinishTime, 9:00:00 in the text field txtstartTime, it returns true. But if I enter any time not from 12:00:00 to 12:59:59 and later than the txtstartTime 9:00:00, such as 9:30:00, it returns false.
Can anybody help me solve this problem? Thanks!!!!
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Question by:leeann
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Accepted Solution

by:
Christoffer Swanström earned 60 total points
ID: 1228027
Your second approach should work with the following modification. Change the line:

SimpleDateFormat formatter = new SimpleDateFormat("hh:mm:ss");

to:

SimpleDateFormat formatter = new SimpleDateFormat("HH:mm:ss");

The difference is that hh uses am/pm notation (hours from 1 to 12) and HH uses 24-hour notation (0 to 23). hh should also work, but for some reason it does not. You can verify this by printing out the values assigned to ET and ST: when the finish time is between 12:00:00 and 12:59:59 ET is negative, which just doesn't make sense (Date.getTime() returns the number of milliseconds elapsed since January 1st, 1970)

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