How to convert date in to yyyy-MM-dd Format

Question

Sat Dec 01 00 00 00 GMT 2012   I have to convert above date into below format      2012-12-01   How can i   i have tried with following method but its not working  public Date ConvertDate Date date        DateFormat df   new SimpleDateFormat  yyyy-MM-dd        String s   df format date       String result   s      try           date df parse result         catch  ParseException e               TODO Auto-generated catch block         e printStackTrace              return date

User · Accepted Answer

Use this   java util Date date   new Date  Sat Dec 01 00 00 00 GMT 2012    SimpleDateFormat formatter   new SimpleDateFormat  yyyy-MM-dd    String format   formatter format date   System out println format     you will get the output as   2012-12-01

User · Answer

A date-time object is supposed to store the information about the date  time  timezone etc   not about the formatting  You can format a date-time object into a String with the pattern of your choice using date-time formatting API   The date-time formatting API for the modern date-time types is in the package  java time format e g  java time format DateTimeFormatter  java time format DateTimeFormatterBuilder etc  The date-time formatting API for the legacy date-time types is in the package  java text e g  java text SimpleDateFormat  java text DateFormat etc   Demo using modern API  import java time LocalDate  import java time Month  import java time ZoneId  import java time ZonedDateTime  import java time format DateTimeFormatter  import java util Locale   public class Main       public static void main String   args            ZonedDateTime zdt   ZonedDateTime of LocalDate of 2012  Month DECEMBER  1  atStartOfDay                    ZoneId of  quot Europe London quot                 Default format returned by Date toString         System out println zdt               Custom format         DateTimeFormatter dtf   DateTimeFormatter ofPattern  quot yyyy-MM-dd quot   Locale ENGLISH           String formattedDate   dtf format zdt           System out println formattedDate            Output  2012-12-01T00 00Z Europe London  2012-12-01  Learn about the modern date-time API from Trail  Date Time  Demo using legacy API  import java text SimpleDateFormat  import java util Calendar  import java util Date  import java util Locale  import java util TimeZone   public class Main       public static void main String   args            Calendar calendar   Calendar getInstance TimeZone getTimeZone  quot GMT quot             calendar setTimeInMillis 0           calendar set Calendar YEAR  2012           calendar set Calendar MONTH  11           calendar set Calendar DAY OF MONTH  1           Date date   calendar getTime                Default format returned by Date toString         System out println date               Custom format         SimpleDateFormat sdf   new SimpleDateFormat  quot yyyy-MM-dd quot   Locale ENGLISH           String formattedDate   sdf format date           System out println formattedDate            Output  Sat Dec 01 00 00 00 GMT 2012 2012-12-01  Some more important points   The java util Date object is not a real date-time object like the modern date-time types  rather  it represents the milliseconds from the Epoch of January 1  1970  When you print an object of java util Date  its toString method returns the date-time calculated from this milliseconds value  Since java util Date does not have timezone information  it applies the timezone of your JVM and displays the same  If you need to print the date-time in a different timezone  you will need to set the timezone to SimpleDateFomrat and obtain the formatted string from it  The date-time API of java util and their formatting API  SimpleDateFormat are outdated and error-prone  It is recommended to stop using them completely and switch to the modern date-time API   For any reason  if you have to stick to Java 6 or Java 7  you can use ThreeTen-Backport which backports most of the java time functionality to Java 6  amp  7  If you are working for an Android project and your Android API level is still not compliant with Java-8  check Java 8  APIs available through desugaring and How to use ThreeTenABP in Android Project

User · Answer

Modern answer  Use LocalDate from java time  the modern Java date and time API  and its toString method       LocalDate date   LocalDate of 2012  Month DECEMBER  1      get from somewhere     String formattedDate   date toString        System out println formattedDate     This prints     2012-12-01   A date  whether we   re talking java util Date or java time LocalDate  doesn   t have a format in it  All it   s got is a toString method that produces some format  and you cannot change the toString method  Fortunately  LocalDate toString produces exactly the format you asked for   The Date class is long outdated  and the SimpleDateFormat class that you tried to use  is notoriously troublesome  I recommend you forget about those classes and use java time instead  The modern API is so much nicer to work with   Except  it happens that you get a Date from a legacy API that you cannot change or don   t want to change just now  The best thing you can do with it is convert it to java time Instant and do any further operations from there       Date oldfashoinedDate      get from somewhere     LocalDate date   oldfashoinedDate toInstant                atZone ZoneId of  Asia Beirut                 toLocalDate      Please substitute your desired time zone if it didn   t happen to be Asia Beirut  Then proceed as above   Link  Oracle tutorial  Date Time  explaining how to use java time

User · Answer

UPDATE My Answer here is now outdated  The Joda-Time project is now in maintenance mode  advising migration to the java time classes  See the modern solution in the Answer by Ole V V     Joda-Time  The accepted answer by NidhishKrishnan is correct   For fun  here is the same kind of code in Joda-Time 2 3         2013 Basil Bourque  This source code may be used freely forever by anyone taking full responsibility for doing so     import org joda time       import org joda time format     java util Date date   new Date       A Date object coming from other code      Pass the java util Date object to constructor of Joda-Time DateTime object  DateTimeZone kolkataTimeZone   DateTimeZone forID   Asia Kolkata     DateTime dateTimeInKolkata   new DateTime  date  kolkataTimeZone     DateTimeFormatter formatter   DateTimeFormat forPattern   yyyy-MM-dd    System out println   dateTimeInKolkata formatted for date      formatter print  dateTimeInKolkata      System out println   dateTimeInKolkata formatted for ISO 8601      dateTimeInKolkata      When run     dateTimeInKolkata formatted for date  2013-12-17 dateTimeInKolkata formatted for ISO 8601  2013-12-17T14 56 46 658 05 30

User · Answer

You can t format the Date itself  You can only get the formatted result in String  Use SimpleDateFormat as mentioned by others   Moreover  most of the getter methods in Date are deprecated

User · Answer

String s  Format formatter  Date date   new Date        2012-12-01 formatter   new SimpleDateFormat  yyyy-MM-dd    s   formatter format date   System out println s

[java] How to convert date in to yyyy-MM-dd Format?

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