LocalDate to java util Date and vice versa simplest conversion

Question

Is there a simple way to convert a LocalDate  introduced with Java 8  to java util Date object     By  simple   I mean simpler than this     Date date   Date from localDate atStartOfDay ZoneId systemDefault    toInstant       which seems a bit awkward to me    Since we are interested only in the date portion and there is no timezone information in neither of the objects  why introduce time zones explicitly  The midnight time and the system default timezone should be taken implicitly for the conversion

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Date to LocalDate  Date date   new Date    LocalDate localDate   date toInstant   atZone ZoneId systemDefault    toLocalDate      LocalDate to Date  LocalDate localDate   LocalDate now    Date date   Date from localDate atStartOfDay ZoneId systemDefault    toInstant

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Date -  LocalDate   LocalDate localDate   date toInstant   atZone ZoneId systemDefault    toLocalDate      LocalDate -  Date   Date date   Date from localDate atStartOfDay ZoneId systemDefault    toInstant

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Actually there is  There is a static method valueOf in the java sql Date object which does exactly that  So we have  java util Date date   java sql Date valueOf localDate     and that s it  No explicit setting of time zones because the local time zone is taken implicitly   From docs      The provided LocalDate is interpreted as the local date in the local   time zone    The java sql Date subclasses java util Date so the result is a java util Date also   And for the reverse operation there is a toLocalDate method in the java sql Date class  So we have   LocalDate ld   new java sql Date date getTime    toLocalDate

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You can convert the java util Date object into a String object  which will format the date as yyyy-mm-dd    LocalDate has a parse method that will convert it to a LocalDate object  The string must represent a valid date and is parsed using DateTimeFormatter ISO LOCAL DATE   Date to LocalDate  LocalDate parse Date toString

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Converting LocalDateTime to java util Date      LocalDateTime localDateTime   LocalDateTime now         ZonedDateTime zonedDateTime   localDateTime atZone ZoneOffset systemDefault          Instant instant   zonedDateTime toInstant         Date date   Date from instant    System out println  Result Date is     date

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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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tl dr  Is there a simple way to convert a LocalDate  introduced with Java 8  to java util Date object  By  simple   I mean simpler than this  Nope  You did it properly  and as concisely as possible  java util Date from                         Convert from modern java time class to troublesome old legacy class   DO NOT DO THIS unless you must  to inter operate with old code not yet updated for java time      myLocalDate                              LocalDate  class represents a date-only  without time-of-day and without time zone nor offset-from-UTC        atStartOfDay                           Let java time determine the first moment of the day on that date in that zone  Never assume the day starts at 00 00 00          ZoneId of   quot America Montreal quot        Specify time zone using proper name in  continent region  format  never 3-4 letter pseudo-zones such as    PST        CST        IST                                                  Produce a  ZonedDateTime  object        toInstant                              Extract an  Instant  object  a moment always in UTC     Read below for issues  and then think about it  How could it be simpler  If you ask me what time does a date start  how else could I respond but ask you    Where       A new day dawns earlier in Paris FR than in Montr  al CA  and still earlier in Kolkata IN  and even earlier in Auckland NZ  all different moments  So in converting a date-only  LocalDate  to a date-time we must apply a time zone  ZoneId  to get a zoned value  ZonedDateTime   and then move into UTC  Instant  to match the definition of a java util Date  Details Firstly  avoid the old legacy date-time classes such as java util Date whenever possible  They are poorly designed  confusing  and troublesome  They were supplanted by the java time classes for a reason  actually  for many reasons  But if you must  you can convert to from java time types to the old  Look for new conversion methods added to the old classes   java util Date   java time LocalDate Keep in mind that a java util Date is a misnomer as it represents a date plus a time-of-day  in UTC  In contrast  the LocalDate class represents a date-only value without time-of-day and without time zone  Going from java util Date to java time means converting to the equivalent class of java time Instant  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     The LocalDate class represents a date-only value without time-of-day and without time zone  A time zone is crucial in determining a date  For any given moment  the date varies around the globe by zone  For example  a few minutes after midnight in Paris France is a new day while still    yesterday    in Montr  al Qu  bec  So we need to move that Instant into a time zone  We apply ZoneId to get a ZonedDateTime  ZoneId z   ZoneId of   quot America Montreal quot     ZonedDateTime zdt   instant atZone  z     From there  ask for a date-only  a LocalDate  LocalDate ld   zdt toLocalDate     java time LocalDate   java util Date To move the other direction  from a java time LocalDate to a java util Date means we are going from a date-only to a date-time  So we must specify a time-of-day  You probably want to go for the first moment of the day  Do not assume that is 00 00 00  Anomalies such as Daylight Saving Time  DST  means the first moment may be another time such as 01 00 00  Let java time determine that value by calling atStartOfDay on the LocalDate  ZonedDateTime zdt   myLocalDate atStartOfDay  z     Now extract an Instant  Instant instant   zdt toInstant     Convert that Instant to java util Date by calling from  Instant    java util Date d   java util Date from  instant     More info  Oracle Tutorial Similar Question  Convert java util Date to what    java time    type    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  To learn more  see the Oracle Tutorial  And search Stack Overflow for many examples and explanations  Specification is JSR 310  The Joda-Time project  now in maintenance mode  advises migration to the java time classes  You may exchange java time objects directly with your database  Use a JDBC driver compliant with JDBC 4 2 or later  No need for strings  no need for java sql   classes  Hibernate 5  amp  JPA 2 2 support java time  Where to obtain the java time classes   Java SE 8  Java SE 9  Java SE 10  Java SE 11  and later  - Part of the standard Java API with a bundled implementation   Java 9 brought some minor features and fixes    Java SE 6 and Java SE 7  Most of the java time functionality is back-ported to Java 6  amp  7 in ThreeTen-Backport    Android  Later versions of Android  26   bundle implementations of the java time classes  For earlier Android   lt 26   a process known as API desugaring brings a subset of the java time functionality not originally built into Android   If the desugaring does not offer what you need  the ThreeTenABP project adapts ThreeTen-Backport  mentioned above  to Android  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

[java] LocalDate to java.util.Date and vice versa simplest conversion?

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