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compare date strings in java

Posted on 2004-09-08
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Last Modified: 2010-03-31
hai,

i have "startDate" and "endDate" and getting them in request.getParameter(). Now i want to compare the date difference between them.

Just want to verfiy if endDate is greater than startDate.
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Question by:ldbkutty
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8 Comments
 
LVL 37

Accepted Solution

by:
zzynx earned 400 total points
ID: 12004230
Date startDate = ...
Date endDate = ...

if ( endDate.after(startDate) ) {
   // do your thing
}
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Assisted Solution

by:Nick_72
Nick_72 earned 50 total points
ID: 12004245
with dates you can use the compareTo method, since they are always of the same length:

if (startDate.compareTo(endDate) < 0)
   //startDate is less (or earlier) than endDate

if (startDate.compareTo(endDate) > 0)
   //the opposite

if (startDate.compareTo(endDate) == 0)
  //both dates are equal

/Nick



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LVL 12

Assisted Solution

by:Giant2
Giant2 earned 50 total points
ID: 12004252
If they are String you could change them in the format:
yyy/mm/dd and after this you can use the comparison between String.
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Expert Comment

by:Giant2
ID: 12004254
:)

yyyy/mm/dd
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LVL 14

Expert Comment

by:sudhakar_koundinya
ID: 12004270
String format="MM/dd/yyyy"
DateFormat myDateFormat = new SimpleDateFormat(strFormat);
Date startdate= null;
Date enddate=null;
try {
     startdate= myDateFormat.parse(request.getParameter("startdate"));
     enddate= myDateFormat.parse(request.getParameter("enddate")
} catch (ParseException e) {
     System.out.println("Invalid Date Parser Exception ");
     e.printStackTrace();
}
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Expert Comment

by:sudhakar_koundinya
ID: 12004271
oops already accepted
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LVL 37

Expert Comment

by:zzynx
ID: 12004276
>> getting them in request.getParameter()
Guess you get them as String then.

String startDate = ...;
String endDate = ...;

SimpleDateFormat fmt = new SimpleDateFormat("yyyy/mm/dd");   // or whatever the format may be
java.util.Date start = fmt.parse(startDate);
java.util.Date end = fmt.parse(endDate);
if ( end.after(start) ) {
   System.out.println("The end date is greater than the start Date");
}
else if ( end.before(start) ) {
   System.out.println("The end date is smaller than the start Date");
}
else {
   System.out.println("The end date equals the start Date");
}
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LVL 37

Expert Comment

by:zzynx
ID: 12004289
>> oops already accepted
Same feeling ;°)

Thanks for accepting ldbkutty.
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