formatting dates using SimpleDateFormat

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Prasad Kharkar is a java enthusiast and always keen to explore and learn java technologies. He is SCJP,OCPWCD, OCEJPAD and aspires to be java architect.

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Hello all, in this tutorial we are going to learn how to format dates and printing them. Java provides a great API just for this called as SimpleDateFormat . This is straight from oracle’s official javadocs.

SimpleDateFormat is a concrete class for formatting and parsing dates in a locale-sensitive manner. It allows for formatting (date -> text), parsing (text -> date), and normalization.

You can take any date object and then use it to form a meaningful representation. We will use string patterns for the same purpose.

Consider we want to print current time in the format DD/MM/YYYY . We will have to use the pattern like "dd/MM/YYYY" .

  • dd represents the day of the month.
  • MM represents name of the month.
  • YYYY represents year.

Consider this example.

This prints 06/08/2013 .

  • In the string, dd/MM/YYYY the letters dd, MM and YYYY have the meaning.Slashes are just used as separator.
  • You can have anything as separator, only the valid formats will be recognized which can be referred from  SimpleDateFormat javadoc.

This program illustrates mostly used formats.

This outputs

 

 

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5 comments for “formatting dates using SimpleDateFormat

  1. July 31, 2014 at 10:15 pm

    Nice article Prasad.
    I would like to know, Is it the right thing to use if we have to format Date always.

    • August 1, 2014 at 10:34 am

      Hi Shanky. Thank you for reading, there is nothing wrong in formatting dates with SimpleDateFormat.

  2. sumit
    May 6, 2016 at 3:15 pm

    can we use object pooling to save the resources when it each time creates object using new keyword. how can we do that

    • May 6, 2016 at 3:47 pm

      You can use it as static variable or retrieve through singleton variable or from some factory pattern.

  3. Alex
    May 26, 2017 at 5:18 am

    Hi Prasad,

    I am trying to use format “yyyy-MM-dd’T’HH:mm:ss.SSSXXX”, but the result is wrong. Can you have a look.

    1. there is a string adjustmentDateTime = “2016-12-03 10:43:51.15”
    2. parse adjustmentDaeTime to Date with format “yyyy-MM-dd HH:mm:ss.SSS” (until now, the millsecond is correct, it is “1475700531150”)
    3. format the date to a string with format “yyyy-MM-dd’T’HH:mm:ss.SSSXXX”.

    The actual result is “2016-10-05T13:48:51.015-07:00”
    but the expected result should be “2016-10-05T13:48:51.150-07:00”.
    Do you have some ideas?

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