How to get UTC 0 date in Java 8

Question

I have problems with Date class in Java  Date class returns local machine date but i need UTC-0   I have googled and found great solution for JavaScript but for Java nothing useful   How to get UTC 0 date in Java 8

User · Answer

In Java8 you use the new Time API  and convert an Instant in to a ZonedDateTime Using the UTC TimeZone

User · Answer

I did this in my project and it works like a charm Date now   new Date    System out println now   TimeZone setDefault TimeZone getTimeZone  quot UTC quot        The magic is here System out println now

User · Answer

In java8  I would use the Instant class which is already in UTC and is convenient to work with    import java time Instant   Instant ins   Instant now    long ts   ins toEpochMilli     Instant ins2   Instant ofEpochMilli ts    Alternatively  you can use the following   import java time     Instant ins   Instant now      OffsetDateTime odt   ins atOffset ZoneOffset UTC   ZonedDateTime zdt   ins atZone ZoneId of  UTC       Back to Instant  Instant ins4   Instant from odt

User · Answer

tl dr Instant now    java time The troublesome old date-time classes bundled with the earliest versions of Java have been supplanted by the java time classes built into Java 8 and later  See Oracle Tutorial  Much of the functionality has been back-ported to Java 6  amp  7 in ThreeTen-Backport and further adapted to Android in ThreeTenABP  Instant An Instant represents a moment on the timeline in UTC with a resolution of up to nanoseconds  Instant instant   Instant now     The toString method generates a String object with text representing the date-time value using one of the standard ISO 8601 formats  String output   instant toString        2016-06-27T19 15 25 864Z  The Instant class is a basic building-block class in java time  This should be your go-to class when handling date-time as generally the best practice is to track  store  and exchange date-time values in UTC  OffsetDateTime But Instant has limitations such as no formatting options for generating strings in alternate formats  For more flexibility  convert from Instant to OffsetDateTime  Specify an offset-from-UTC  In java time that means a ZoneOffset object  Here we want to stick with UTC   00  so we can use the convenient constant ZoneOffset UTC  OffsetDateTime odt   instant atOffset  ZoneOffset UTC      2016-06-27T19 15 25 864Z  Or skip the Instant class  OffsetDateTime now  ZoneOffset UTC    Now with an OffsetDateTime object in hand  you can use DateTimeFormatter to create String objects with text in alternate formats  Search Stack Overflow for many examples of using DateTimeFormatter  ZonedDateTime When you want to display wall-clock time for some particular time zone  apply a ZoneId to get a ZonedDateTime  In this example we apply Montr  al time zone  In the summer  under Daylight Saving Time  DST  nonsense  the zone has an offset of -04 00  So note how the time-of-day is four hours earlier in the output  15 instead of 19 hours  Instant and the ZonedDateTime both represent the very same simultaneous moment  just viewed through two different lenses  ZoneId z   ZoneId of   quot America Montreal quot     ZonedDateTime zdt   instant atZone  z      2016-06-27T15 15 25 864-04 00 America Montreal   Converting While you should avoid the old date-time classes  if you must you can convert using new methods added to the old classes  Here we use java util Date from  Instant   and java util Date  toInstant  java util Date utilDate   java util Date from  instant     And going the other direction  Instant instant  utilDate toInstant     Similarly  look for new methods added to GregorianCalendar  subclass of Calendar  to convert to and from java time ZonedDateTime    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

User · Answer

With Java 8 you can write  OffsetDateTime utc   OffsetDateTime now ZoneOffset UTC    To answer your comment  you can then convert it to a Date  unless you depend on legacy code I don t see any reason why  or to millis since the epochs  Date date   Date from utc toInstant     long epochMillis   utc toInstant   toEpochMilli

User · Answer

1 line solution in Java 8   public Date getCurrentUtcTime         return Date from Instant now

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