Change date format in a Java string

Question

I ve a String representing a date   String date s    2011-01-18 00 00 00 0     I d like to convert it to a Date and output it in YYYY-MM-DD format      2011-01-18   How can I achieve this     Okay  based on the answers I retrieved below  here s something I ve tried   String date s     2011-01-18 00 00 00 0    SimpleDateFormat dt   new SimpleDateFormat  yyyyy-mm-dd hh mm ss     Date date   dt parse date s    SimpleDateFormat dt1   new SimpleDateFormat  yyyyy-mm-dd    System out println dt1 format date      But it outputs 02011-00-1 instead of the desired 2011-01-18  What am I doing wrong

User · Answer

Why not simply use this Date convertToDate String receivedDate  throws ParseException          SimpleDateFormat formatter   new SimpleDateFormat  quot dd-MM-yyyy quot            Date date   formatter parse receivedDate           return date         Also  this is the other way   DateFormat df   new SimpleDateFormat  quot dd MM yyyy quot    String requiredDate   df format new Date    toString     or Date requiredDate   df format new Date

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You can also use substring    String date s    2011-01-18 00 00 00 0   date s substring 0 10     If you want a space in front of the date  use  String date s     2011-01-18 00 00 00 0   date s substring 1 11

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Say you want to change 2019-12-20 10 50 AM GMT 6 00 to 2019-12-20 10 50 AM  first of all you have to understand the date format first one date format is  yyyy-MM-dd hh mm a zzz and second one date format will be yyyy-MM-dd hh mm a   just return a string from this function like    public String convertToOnlyDate String currentDate        SimpleDateFormat dateFormat   new SimpleDateFormat  yyyy-MM-dd hh mm a         Date date      String dateString           try           date   dateFormat parse currentDate           System out println date toString               dateString   dateFormat format date         catch  ParseException e            e printStackTrace              return dateString      This function will return your desire answer  If you want to customize more just add or remove component from the date format

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SimpleDateFormat dt1   new SimpleDateFormat  quot yyyy-mm-dd quot

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You could try Java 8 new date  more information can be found on the Oracle documentation       Or you can try the old one   public static Date getDateFromString String format  String dateStr         DateFormat formatter   new SimpleDateFormat format       Date date   null      try           date    Date  formatter parse dateStr         catch  ParseException e            e printStackTrace               return date     public static String getDate Date date  String dateFormat        DateFormat formatter   new SimpleDateFormat dateFormat       return formatter format date

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String str    2000-12-12      Date dt   null     SimpleDateFormat formatter   new SimpleDateFormat  yyyy-MM-dd         try                 dt   formatter parse str             catch  Exception e                   JOptionPane showMessageDialog null  formatter format dt

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You can just use   Date yourDate   new Date     SimpleDateFormat DATE FORMAT   new SimpleDateFormat  yyyy-MM-dd    String date   DATE FORMAT format yourDate     It works perfectly

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try        String date s    2011-01-18 00 00 00 0       SimpleDateFormat simpledateformat   new SimpleDateFormat  yyyy-MM-dd HH mm ss S        Date tempDate simpledateformat parse date s       SimpleDateFormat outputDateFormat   new SimpleDateFormat  yyyy-MM-dd                   System out println  Output date is     outputDateFormat format tempDate        catch  ParseException ex               System out println  Parse Exception

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Other answers are correct  basically you had the wrong number of  y  characters in your pattern   Time Zone  One more problem though    You did not address time zones  If you intended UTC  then you should have said so  If not  the answers are not complete  If all you want is the date portion without the time  then no issue  But if you do further work that may involve time  then you should be specifying a time zone   Joda-Time  Here is the same kind of code but using the third-party open-source Joda-Time 2 3 library        2013 Basil Bourque  This source code may be used freely forever by anyone taking full responsibility for doing so   String date s    2011-01-18 00 00 00 0    org joda time format DateTimeFormatter formatter   org joda time format DateTimeFormat forPattern   yyyy-MM-dd   HH mm ss SSS        By the way  if your date-time string conformed strictly to ISO 8601 including a  T  rather than a SPACE      you could    use a formatter built into Joda-Time rather than specify your own  ISODateTimeFormat dateHourMinuteSecondFraction       Like this    org joda time DateTime dateTimeInUTC   org joda time format ISODateTimeFormat dateHourMinuteSecondFraction   withZoneUTC   parseDateTime  date s        Assuming the date-time string was meant to be in UTC  no time zone offset   org joda time DateTime dateTimeInUTC   formatter withZoneUTC   parseDateTime  date s    System out println   dateTimeInUTC      dateTimeInUTC    System out println   dateTimeInUTC  date only       org joda time format ISODateTimeFormat date   print  dateTimeInUTC      System out println           blank line      Assuming the date-time string was meant to be in Kolkata time zone  formerly known as Calcutta   Offset is  5 30 from UTC  note the half-hour   org joda time DateTimeZone kolkataTimeZone   org joda time DateTimeZone forID   Asia Kolkata     org joda time DateTime dateTimeInKolkata   formatter withZone  kolkataTimeZone   parseDateTime  date s    System out println   dateTimeInKolkata      dateTimeInKolkata    System out println   dateTimeInKolkata  date only       org joda time format ISODateTimeFormat date   print  dateTimeInKolkata         This date-time in Kolkata is a different point in the time line of the Universe than the dateTimeInUTC instance created above  The date is even different  System out println   dateTimeInKolkata adjusted to UTC      dateTimeInKolkata toDateTime  org joda time DateTimeZone UTC        When run     dateTimeInUTC  2011-01-18T00 00 00 000Z dateTimeInUTC  date only   2011-01-18  dateTimeInKolkata  2011-01-18T00 00 00 000 05 30 dateTimeInKolkata  date only   2011-01-18 dateTimeInKolkata adjusted to UTC  2011-01-17T18 30 00 000Z

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Please refer  Date and Time Patterns  here  http   docs oracle com javase 7 docs api java text SimpleDateFormat html      import java text SimpleDateFormat  import java util Date  import java text ParseException   public class DateConversionExample     public static void main String arg          try       SimpleDateFormat sourceDateFormat   new SimpleDateFormat  yyyy-MM-DD HH mm ss         Date date   sourceDateFormat parse  2011-01-18 00 00 00 0          SimpleDateFormat targetDateFormat   new SimpleDateFormat  yyyy-MM-dd        System out println targetDateFormat format date          catch ParseException e           e printStackTrace

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remove one y form the format provide to  SimpleDateFormat dt1   new SimpleDateFormat  quot yyyyy-mm-dd quot     It should be  SimpleDateFormat dt1   new SimpleDateFormat  quot yyyy-mm-dd quot

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Use LocalDateTime parse    or ZonedDateTime parse   if the string happens to contain a time zone part  to parse a String in a certain pattern into a LocalDateTime   String oldstring    2011-01-18 00 00 00 0   LocalDateTime datetime   LocalDateTime parse oldstring  DateTimeFormatter ofPattern  yyyy-MM-dd HH mm ss S       Use LocalDateTime format    or ZonedDateTime format    to format a LocalDateTime into a String in a certain pattern   String newstring   datetime format DateTimeFormatter ofPattern  yyyy-MM-dd     System out println newstring      2011-01-18   Or  when you re not on Java 8 yet  use SimpleDateFormat parse   to parse a String in a certain pattern into a Date   String oldstring    2011-01-18 00 00 00 0   Date date   new SimpleDateFormat  yyyy-MM-dd HH mm ss S   parse oldstring     Use SimpleDateFormat format   to format a Date into a String in a certain pattern   String newstring   new SimpleDateFormat  yyyy-MM-dd   format date   System out println newstring      2011-01-18   See also    Java string to date conversion     Update  as per your failed attempt  the patterns are case sensitive  Read the java text SimpleDateFormat javadoc what the individual parts stands for  So stands for example M for months and m for minutes  Also  years exist of four digits yyyy  not five yyyyy  Look closer at the code snippets I posted here above

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private SimpleDateFormat dataFormat   new SimpleDateFormat  dd MM yyyy      Override public Component getTableCellRendererComponent JTable table  Object value  boolean isSelected  boolean hasFocus  int row  int column        if value instanceof Date            value   dataFormat format value             return super getTableCellRendererComponent table  value  isSelected  hasFocus  row  column

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We can convert Today s date in the format of  JUN 12  2020   String valueOf DateFormat getDateInstance   format new Date

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Formatting are CASE-SENSITIVE so USE MM for month not mm  this is for minute  and yyyy  For Reference you can use following cheatsheet   G   Era designator  Text    AD y   Year    Year    1996  96 Y   Week year   Year    2009  09 M   Month in year   Month   July  Jul  07 w   Week in year    Number  27 W   Week in month   Number  2 D   Day in year Number  189 d   Day in month    Number  10 F   Day of week in month    Number  2 E   Day name in week    Text    Tuesday  Tue u   Day number of week  1   Monday       7   Sunday     Number  1 a   Am pm marker    Text    PM H   Hour in day  0-23   Number  0 k   Hour in day  1-24   Number  24 K   Hour in am pm  0-11     Number  0 h   Hour in am pm  1-12     Number  12 m   Minute in hour  Number  30 s   Second in minute    Number  55 S   Millisecond Number  978 z   Time zone   General time zone   Pacific Standard Time  PST  GMT-08 00 Z   Time zone   RFC 822 time zone   -0800 X   Time zone   ISO 8601 time zone  -08  -0800  -08 00   Examples    yyyy MM dd G  at  HH mm ss z   2001 07 04 AD at 12 08 56 PDT  EEE  MMM d    yy   Wed  Jul 4   01  h mm a     12 08 PM  hh  o  clock  a  zzzz  12 o clock PM  Pacific Daylight Time  K mm a  z  0 08 PM  PDT  yyyyy MMMMM dd GGG hh mm aaa   02001 July 04 AD 12 08 PM  EEE  d MMM yyyy HH mm ss Z     Wed  4 Jul 2001 12 08 56 -0700  yyMMddHHmmssZ  010704120856-0700  yyyy-MM-dd T HH mm ss SSS Z     2001-07-04T12 08 56 235-0700  yyyy-MM-dd T HH mm ss SSSXXX    2001-07-04T12 08 56 235-07 00  YYYY- W ww-u   2001-W27-3

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public class SystemDateTest        String stringDate       public static void main String   args            SystemDateTest systemDateTest   new SystemDateTest               format date into String         SimpleDateFormat simpleDateFormat   new SimpleDateFormat  dd-MM-yyyy hh mm ss            systemDateTest setStringDate simpleDateFormat format systemDateTest getDate              System out println systemDateTest getStringDate                public Date getDate             return new Date               public String getStringDate             return stringDate             public void setStringDate String stringDate            this stringDate   stringDate

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edited to include BalusC s corrections  The SimpleDateFormat class should do the trick   String pattern    yyyy-MM-dd HH mm ss S   SimpleDateFormat format   new SimpleDateFormat pattern   try     Date date   format parse  2011-01-18 00 00 00 0      System out println date     catch  ParseException e      e printStackTrace

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The answer is of course to create a SimpleDateFormat object and use it to parse Strings to Date and to format Dates to Strings   If you ve tried SimpleDateFormat and it didn t work  then please show your code and any errors you may receive   Addendum    mm  in the format String is not the same as  MM    Use MM for months and mm for minutes  Also  yyyyy is not the same as yyyy   e g     import java text ParseException  import java text SimpleDateFormat  import java util Date   public class FormateDate        public static void main String   args  throws ParseException           String date s    2011-01-18 00 00 00 0                   note that it s  yyyy-MM-dd hh mm ss  not  yyyy-mm-dd hh mm ss            SimpleDateFormat dt   new SimpleDateFormat  yyyy-MM-dd hh mm ss            Date date   dt parse date s                   same for the format String below         SimpleDateFormat dt1   new SimpleDateFormat  yyyy-MM-dd            System out println dt1 format date

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Using the java time package in Java 8 and later   String date    2011-01-18 00 00 00 0   TemporalAccessor temporal   DateTimeFormatter      ofPattern  yyyy-MM-dd HH mm ss S        parse date      use parse date  LocalDateTime  from  to get LocalDateTime String output   DateTimeFormatter ofPattern  yyyy-MM-dd   format temporal

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