Convert java util Date to java time LocalDate

Question

What is the best way to convert a java util Date object to the new JDK 8 JSR-310 java time LocalDate   Date input   new Date    LocalDate date

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I have had problems with  JodaStephen s implementation on JBoss EAP 6  So  I rewrote the conversion following Oracle s Java Tutorial in http   docs oracle com javase tutorial datetime iso legacy html       Date input   new Date        GregorianCalendar gregorianCalendar    GregorianCalendar  Calendar getInstance        gregorianCalendar setTime input       ZonedDateTime zonedDateTime   gregorianCalendar toZonedDateTime        zonedDateTime toLocalDate

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What s wrong with this 1 simple line   new LocalDateTime new Date   getTime    toLocalDate

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public static LocalDate Date2LocalDate Date date            return LocalDate parse date toString    DateTimeFormatter ofPattern  EEE MMM dd HH mm ss zzz yyyy      this format is from Date tostring      public String toString                 EEE MMM dd HH mm ss zzz yyyy           BaseCalendar Date date   normalize            StringBuilder sb   new StringBuilder 28           int index   date getDayOfWeek            if  index    BaseCalendar SUNDAY                index   8                    convertToAbbr sb  wtb index   append                                 EEE         convertToAbbr sb  wtb date getMonth   - 1   2   7   append           MMM         CalendarUtils sprintf0d sb  date getDayOfMonth    2  append          dd          CalendarUtils sprintf0d sb  date getHours    2  append            HH         CalendarUtils sprintf0d sb  date getMinutes    2  append          mm         CalendarUtils sprintf0d sb  date getSeconds    2  append          ss         TimeZone zi   date getZone            if  zi    null                sb append zi getDisplayName date isDaylightTime    TimeZone SHORT  Locale US       zzz           else               sb append  GMT                      sb append      append date getYear         yyyy         return sb toString

User · Answer

If you are using ThreeTen Backport including ThreeTenABP     Date input   new Date       Imagine your Date here     LocalDate date   DateTimeUtils toInstant input               atZone ZoneId systemDefault                 toLocalDate     If you are using the backport of JSR 310  either you haven   t got a Date toInstant   method or it won   t give you the org threeten bp Instant that you need for you further conversion  Instead you need to use the DateTimeUtils class that comes as part of the backport  The remainder of the conversion is the same  so so is the explanation

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I solved this question with solution below    import org joda time LocalDate    Date myDate   new Date      LocalDate localDate   LocalDate fromDateFields myDate     System out println  My date using Date  Nov 18 11 23 33 BRST 2016     System out println  My date using joda time LocalTime  2016-11-18     In this case localDate print your date in this format  yyyy-MM-dd

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You can convert in one line    public static LocalDate getLocalDateFromDate Date date      return LocalDate from Instant ofEpochMilli date getTime    atZone ZoneId systemDefault

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LocalDate ld   new java sql Date  new java util Date   getTime     toLocalDate

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LocalDate localDate   LocalDate parse  new SimpleDateFormat  yyyy-MM-dd   format date

User · Answer

If you re using Java 8   JodaStephen s answer is obviously the best   However  if you re working with the JSR-310 backport  you unfortunately have to do something like this   Date input   new Date    Calendar cal   Calendar getInstance    cal setTime input   LocalDate date   LocalDate of cal get Calendar YEAR           cal get Calendar MONTH    1          cal get Calendar DAY OF MONTH

User · Answer

first  it s easy to convert a Date to an Instant  Instant timestamp   new Date   toInstant       Then  you can convert the Instant to any date api in jdk 8 using ofInstant   method   LocalDateTime date   LocalDateTime ofInstant timestamp  ZoneId systemDefault

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Better way is   Date date        Instant ofEpochMilli date getTime    atZone ZoneId systemDefault    toLocalDate     Advantages of this version    works regardless the input is an instance of java util Date or it s a subclass of java sql Date  unlike  JodaStephen s way   This is common with JDBC-originated data  java sql Date toInstant   always throws an exception  it s the same for JDK8 and JDK7 with JSR-310 backport   I personally use an utility class  but it is not backport-compatible           Utilities for conversion between the old and new JDK date types      between   code java util Date  and   code java time              lt p gt     All methods are null-safe      public class DateConvertUtils                   Calls   link  asLocalDate Date  ZoneId   with the system default time zone              public static LocalDate asLocalDate java util Date date            return asLocalDate date  ZoneId systemDefault                           Creates   link LocalDate  from   code java util Date  or it s subclasses  Null-safe              public static LocalDate asLocalDate java util Date date  ZoneId zone            if  date    null              return null           if  date instanceof java sql Date              return   java sql Date  date  toLocalDate            else             return Instant ofEpochMilli date getTime    atZone zone  toLocalDate                          Calls   link  asLocalDateTime Date  ZoneId   with the system default time zone              public static LocalDateTime asLocalDateTime java util Date date            return asLocalDateTime date  ZoneId systemDefault                           Creates   link LocalDateTime  from   code java util Date  or it s subclasses  Null-safe              public static LocalDateTime asLocalDateTime java util Date date  ZoneId zone            if  date    null              return null           if  date instanceof java sql Timestamp              return   java sql Timestamp  date  toLocalDateTime            else             return Instant ofEpochMilli date getTime    atZone zone  toLocalDateTime                          Calls   link  asUtilDate Object  ZoneId   with the system default time zone              public static java util Date asUtilDate Object date            return asUtilDate date  ZoneId systemDefault                           Creates a   link java util Date  from various date objects  Is null-safe  Currently supports  lt ul gt          lt li gt   link java util Date          lt li gt   link java sql Date          lt li gt   link java sql Timestamp          lt li gt   link java time LocalDate          lt li gt   link java time LocalDateTime          lt li gt   link java time ZonedDateTime          lt li gt   link java time Instant          lt  ul gt                  param zone Time zone  used only if the input object is LocalDate or LocalDateTime                  return   link java util Date   exactly this class  not a subclass  such as java sql Date              public static java util Date asUtilDate Object date  ZoneId zone            if  date    null              return null           if  date instanceof java sql Date    date instanceof java sql Timestamp              return new java util Date   java util Date  date  getTime             if  date instanceof java util Date              return  java util Date  date          if  date instanceof LocalDate              return java util Date from   LocalDate  date  atStartOfDay zone  toInstant             if  date instanceof LocalDateTime              return java util Date from   LocalDateTime  date  atZone zone  toInstant             if  date instanceof ZonedDateTime              return java util Date from   ZonedDateTime  date  toInstant             if  date instanceof Instant              return java util Date from  Instant  date            throw new UnsupportedOperationException  Don t know hot to convert     date getClass   getName       to java util Date                          Creates an   link Instant  from   code java util Date  or it s subclasses  Null-safe              public static Instant asInstant Date date            if  date    null              return null          else             return Instant ofEpochMilli date getTime                           Calls   link  asZonedDateTime Date  ZoneId   with the system default time zone              public static ZonedDateTime asZonedDateTime Date date            return asZonedDateTime date  ZoneId systemDefault                           Creates   link ZonedDateTime  from   code java util Date  or it s subclasses  Null-safe              public static ZonedDateTime asZonedDateTime Date date  ZoneId zone            if  date    null              return null          else             return asInstant date  atZone zone              The asLocalDate   method here is null-safe  uses toLocalDate    if input is java sql Date  it may be overriden by the JDBC driver to avoid timezone problems or unnecessary calculations   otherwise uses the abovementioned method

User · Answer

Short answer  Date input   new Date    LocalDate date   input toInstant   atZone ZoneId systemDefault    toLocalDate      Explanation  Despite its name  java util Date represents an instant on the time-line  not a  date   The actual data stored within the object is a long count of milliseconds since 1970-01-01T00 00Z  midnight at the start of 1970 GMT UTC    The equivalent class to java util Date in JSR-310 is Instant  thus there is a convenient method toInstant   to provide the conversion   Date input   new Date    Instant instant   input toInstant      A java util Date instance has no concept of time-zone  This might seem strange if you call toString   on a java util Date  because the toString is relative to a time-zone  However that method actually uses Java s default time-zone on the fly to provide the string  The time-zone is not part of the actual state of java util Date   An Instant also does not contain any information about the time-zone  Thus  to convert from an Instant to a local date it is necessary to specify a time-zone  This might be the default zone - ZoneId systemDefault   - or it might be a time-zone that your application controls  such as a time-zone from user preferences  Use the atZone   method to apply the time-zone   Date input   new Date    Instant instant   input toInstant    ZonedDateTime zdt   instant atZone ZoneId systemDefault       A ZonedDateTime contains state consisting of the local date and time  time-zone and the offset from GMT UTC  As such the date - LocalDate - can be easily extracted using toLocalDate     Date input   new Date    Instant instant   input toInstant    ZonedDateTime zdt   instant atZone ZoneId systemDefault     LocalDate date   zdt toLocalDate      Java 9 answer  In Java SE 9  a new method has been added that slightly simplifies this task   Date input   new Date    LocalDate date   LocalDate ofInstant input toInstant    ZoneId systemDefault       This new alternative is more direct  creating less garbage  and thus should perform better

User · Answer

Date input   new Date    LocalDateTime  conv LocalDateTime ofInstant input toInstant    ZoneId systemDefault     LocalDate convDate conv toLocalDate      The Date instance does contain time too along with the date while LocalDate doesn t  So you can firstly convert it into LocalDateTime using its method ofInstant   then if you want it without time then convert the instance into LocalDate

[java] Convert java.util.Date to java.time.LocalDate

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