java util Date format conversion yyyy-mm-dd to mm-dd-yyyy

Question

I have a java util Date in the format yyyy-mm-dd  I want it to be in the format mm-dd-yyyy Below is the sample util I tried out for this conversion     Setting the pattern SimpleDateFormat sm   new SimpleDateFormat  quot mm-dd-yyyy quot       myDate is the java util Date in yyyy-mm-dd format    Converting it into String using formatter String strDate   sm format myDate     Converting the String back to java util Date Date dt   sm parse strDate    Still the output I am getting is not in the format mm-dd-yyyy  Kindly let me know how to format a java util Date from yyyy-mm-dd to mm-dd-yyyy

User · Answer

Please change small  quot mm quot  month to capital  quot MM quot  it will work for reference below is the sample code          Date myDate   new Date            SimpleDateFormat sm   new SimpleDateFormat  quot MM-dd-yyyy quot                    String strDate   sm format myDate                    Date dt   sm parse strDate           System out println strDate

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SimpleDateFormat  MM-dd-yyyy      instead of   SimpleDateFormat  mm-dd-yyyy      because MM points Month  mm points minutes  SimpleDateFormat sm   new SimpleDateFormat  MM-dd-yyyy    String strDate   sm format myDate

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tl dr  LocalDate parse        01-23-2017         DateTimeFormatter ofPattern   MM-dd-uuuu        Details     I have a java util Date in the format yyyy-mm-dd   As other mentioned  the Date class has no format  It has a count of milliseconds since the start of 1970 in UTC  No strings attached   java time  The other Answers use troublesome old legacy date-time classes  now supplanted by the java time classes    If you have a java util Date  convert to a Instant object  The Instant class represents a moment on the timeline in UTC with a resolution of nanoseconds  up to nine  9  digits of a decimal fraction     Instant instant   myUtilDate toInstant      Time zone  The other Answers ignore the crucial issue of time zone  Determining a date requires a time zone  For any given moment  the date varies around the globe by zone  A few minutes after midnight in Paris France is a new day  while still    yesterday    in Montr  al Qu  bec    Define the time zone by which you want context for your Instant   ZoneId z   ZoneId of   America Montreal       Apply the ZoneId to get a ZonedDateTime   ZonedDateTime zdt   instant atZone  z      LocalDate  If you only care about the date without a time-of-day  extract a LocalDate   LocalDate localDate   zdt toLocalDate      To generate a string in standard ISO 8601 format  YYYY-MM-DD  simply call toString  The java time classes use the standard formats by default when generating parsing strings   String output   localDate toString         2017-01-23   If you want a MM-DD-YYYY format  define a formatting pattern   DateTimeFormatter f   DateTimeFormatter ofPattern   MM-dd-uuuu     String output   localDate format  f      Note that the formatting pattern codes are case-sensitive  The code in the Question incorrectly used mm  minute of hour  rather than MM  month of year     Use the same DateTimeFormatter object for parsing  The java time classes are thread-safe  so you can keep this object around and reuse it repeatedly even across threads   LocalDate localDate   LocalDate parse   01-23-2017    f        About java time  The java time framework is built into Java 8 and later  These classes supplant the troublesome old legacy date-time classes such as java util Date  Calendar   amp  SimpleDateFormat   The Joda-Time project  now in maintenance mode  advises migration to the java time classes   To learn more  see the Oracle Tutorial  And search Stack Overflow for many examples and explanations  Specification is JSR 310   Where to obtain the java time classes     Java SE 8 and SE 9 and later   Built-in   Part of the standard Java API with a bundled implementation  Java 9 adds some minor features and fixes   Java SE 6 and SE 7   Much of the java time functionality is back-ported to Java 6  amp  7 in ThreeTen-Backport   Android   The ThreeTenABP project adapts ThreeTen-Backport  mentioned above  for Android specifically  See How to use ThreeTenABP        The ThreeTen-Extra project extends java time with additional classes  This project is a proving ground for possible future additions to java time  You may find some useful classes here such as Interval  YearWeek  YearQuarter  and more

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It is simple use below codes   final Date todayDate   new Date     System out println todayDate    System out println new SimpleDateFormat  MM-dd-yyyy   format todayDate     System out println new SimpleDateFormat  yyyy-MM-dd   format todayDate     System out println todayDate

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You may get day  month and year and may concatenate them or may use MM-dd-yyyy format as given below   Date date1   new Date    String mmddyyyy1   new SimpleDateFormat  MM-dd-yyyy   format date1   System out println  Formatted Date 1      mmddyyyy1      Date date2   new Date    Calendar calendar1   new GregorianCalendar    calendar1 setTime date2   int day1     calendar1 get Calendar DAY OF MONTH   int month1   calendar1 get Calendar MONTH    1      0 - 11  int year1    calendar1 get Calendar YEAR   String mmddyyyy2     month1 lt 10   0  month1 month1     -      day1 lt 10   0  day1 day1     -     year1   System out println  Formatted Date 2      mmddyyyy2      LocalDateTime ldt1   LocalDateTime now      DateTimeFormatter format1   DateTimeFormatter ofPattern  MM-dd-yyyy      String mmddyyyy3   ldt1 format format1     System out println  Formatted Date 3      mmddyyyy3        LocalDateTime ldt2   LocalDateTime now    int day2   ldt2 getDayOfMonth    int mont2  ldt2 getMonthValue    int year2  ldt2 getYear    String mmddyyyy4     mont2 lt 10   0  mont2 mont2     -      day2 lt 10   0  day2 day2     -     year2   System out println  Formatted Date 4      mmddyyyy4      LocalDateTime ldt3   LocalDateTime of 2020  6  11  14  30      int year  int month  int dayOfMonth  int hour  int minute DateTimeFormatter format2   DateTimeFormatter ofPattern  MM-dd-yyyy      String mmddyyyy5   ldt3 format format2      System out println  Formatted Date 5      mmddyyyy5       Calendar calendar2   Calendar getInstance    calendar2 setTime new Date     int day3    calendar2 get Calendar DAY OF MONTH      OR Calendar DATE int month3  calendar2 get Calendar MONTH    1  int year3   calendar2 get Calendar YEAR   String mmddyyyy6     month3 lt 10   0  month3 month3     -      day3 lt 10   0  day3 day3     -     year3   System out println  Formatted Date 6      mmddyyyy6      Date date3   new Date    LocalDate ld1   LocalDate parse new SimpleDateFormat  yyyy-MM-dd   format date3       Accepts only yyyy-MM-dd int day4    ld1 getDayOfMonth    int month4  ld1 getMonthValue    int year4   ld1 getYear    String mmddyyyy7     month4 lt 10   0  month4 month4     -      day4 lt 10   0  day4 day4     -     year4   System out println  Formatted Date 7      mmddyyyy7      Date date4   new Date    int day5     LocalDate parse new SimpleDateFormat  yyyy-MM-dd   format date4   getDayOfMonth    int month5   LocalDate parse new SimpleDateFormat  yyyy-MM-dd   format date4   getMonthValue    int year5    LocalDate parse new SimpleDateFormat  yyyy-MM-dd   format date4   getYear    String mmddyyyy8     month5 lt 10   0  month5 month5     -      day5 lt 10   0  day5 day5     -     year5   System out println  Formatted Date 8      mmddyyyy8      Date date5   new Date    int day6     Integer parseInt new SimpleDateFormat  dd   format date5    int month6   Integer parseInt new SimpleDateFormat  MM   format date5    int year6    Integer parseInt new SimpleDateFormat  yyyy   format date5    String mmddyyyy9     month6 lt 10   0  month6 month6     -      day6 lt 10   0  day6 day6     -     year6   enter code here  System out println  Formatted Date 9      mmddyyyy9

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see these    formatting date  DateTimeFormatter  parsing date  Instant with zone

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Date is a container for the number of milliseconds since the Unix epoch   00 00 00 UTC on 1 January 1970    It has no concept of format   Java 8   LocalDateTime ldt   LocalDateTime now    System out println DateTimeFormatter ofPattern  MM-dd-yyyy   Locale ENGLISH  format ldt    System out println DateTimeFormatter ofPattern  yyyy-MM-dd   Locale ENGLISH  format ldt    System out println ldt     Outputs     05-11-2018 2018-05-11 2018-05-11T17 24 42 980   Java 7-  You should be making use of the ThreeTen Backport  Original Answer  For example     Date myDate   new Date    System out println myDate   System out println new SimpleDateFormat  MM-dd-yyyy   format myDate    System out println new SimpleDateFormat  yyyy-MM-dd   format myDate    System out println myDate     Outputs     Wed Aug 28 16 20 39 EST 2013 08-28-2013 2013-08-28 Wed Aug 28 16 20 39 EST 2013   None of the formatting has changed the underlying Date value   This is the purpose of the DateFormatters  Updated with additional example  Just in case the first example didn t make sense     This example uses two formatters to format the same date   I then use these same formatters to parse the String values back to Dates   The resulting parse does not alter the way Date reports it s value   Date toString is just a dump of it s contents   You can t change this  but you can format the Date object any way you like  try       Date myDate   new Date        System out println myDate        SimpleDateFormat mdyFormat   new SimpleDateFormat  MM-dd-yyyy        SimpleDateFormat dmyFormat   new SimpleDateFormat  yyyy-MM-dd            Format the date to Strings     String mdy   mdyFormat format myDate       String dmy   dmyFormat format myDate           Results        System out println mdy       System out println dmy          Parse the Strings back to dates        Note  the formats don t  stick  with the Date value     System out println mdyFormat parse mdy        System out println dmyFormat parse dmy      catch  ParseException exp        exp printStackTrace        Which outputs     Wed Aug 28 16 24 54 EST 2013 08-28-2013 2013-08-28 Wed Aug 28 00 00 00 EST 2013 Wed Aug 28 00 00 00 EST 2013   Also  be careful of the format patterns   Take a closer look at SimpleDateFormat to make sure you re not using the wrong patterns

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M   Capital  represent month  amp   m   Simple  represent minutes  Some example for months   M  - gt  7   without prefix 0 if it is single digit   M  - gt  12   MM  - gt  07  with prefix 0 if it is single digit   MM  - gt  12   MMM  - gt  Jul  display with 3 character    MMMM  - gt  December  display with full name    Some example for minutes   m  - gt  3   without prefix 0 if it is single digit   m  - gt  19  mm  - gt  03  with prefix 0 if it is single digit   mm  - gt  19

[java] java.util.Date format conversion yyyy-mm-dd to mm-dd-yyyy

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