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Time comparison

Posted on 2011-09-11
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Last Modified: 2012-05-12
Given a string representation of a time slot  say "08:00", I want to compare it with the current time and return true of if it less than the current time.

If possible, please provide some sample code. Thanks!
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Question by:dshrenik
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6 Comments
 
LVL 47

Expert Comment

by:for_yan
ID: 36519924
 SimpleDateFormat sdff = new SimpleDateFormat("yyyy-MM-dd");
        SimpleDateFormat sdff1 = new SimpleDateFormat("yyyy-MM-dd HH:mm");

        java.util.Date ddd = new java.util.Date();
        String dss = sdff.format(ddd);
        String s8 = "08:00";

           java.util.Date ddd1 = sdff1.parse(dss + " " + s8, new ParsePosition(0) );

        if(ddd.after(ddd1)){
            
            System.out.println("after");
        }   else    System.out.println("before");

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Output:
after

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Author Comment

by:dshrenik
ID: 36519932
Can we do this comparison between SimpleDateFormat  and a String like "08:00" or "15:00"? Thanks!
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LVL 47

Accepted Solution

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for_yan earned 2000 total points
ID: 36519936
ths one will return true or false as you want
 SimpleDateFormat sdff = new SimpleDateFormat("yyyy-MM-dd");
        SimpleDateFormat sdff1 = new SimpleDateFormat("yyyy-MM-dd HH:mm");

        java.util.Date ddd = new java.util.Date();
        String dss = sdff.format(ddd);
        String s8 = "08:00";

           java.util.Date ddd1 = sdff1.parse(dss + " " + s8, new ParsePosition(0) );

        if(ddd.before(ddd1)){
            
            System.out.println("true");
        }   else    System.out.println("false");

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Output:
false

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LVL 47

Expert Comment

by:for_yan
ID: 36519941
Don't understand your question - I used s = "08:00"
- you can pass this strng as aparaemeter to the nmethod and it can be "08:00" or "15:00" - whatwever you feed
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Author Comment

by:dshrenik
ID: 36519955
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LVL 47

Expert Comment

by:for_yan
ID: 36519959



  System.out.println(ifItIsBefore("15:00"));

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 public static boolean ifItIsBefore(String s8){


        SimpleDateFormat sdff = new SimpleDateFormat("yyyy-MM-dd");
              SimpleDateFormat sdff1 = new SimpleDateFormat("yyyy-MM-dd HH:mm");

              java.util.Date ddd = new java.util.Date();
              String dss = sdff.format(ddd);
            //  String s8 = "08:00";

                 java.util.Date ddd1 = sdff1.parse(dss + " " + s8, new ParsePosition(0) );

              if(ddd.before(ddd1)){

                  return  true;
              }   else    return false;


    }

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true

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