Java Date from unix timestamp

Question

I need to convert a unix timestamp to a date object  I tried this   java util Date time   new java util Date timeStamp     Timestamp value is  1280512800  The Date should be  2010 07 30 - 22 30 00   as I get it by PHP  but instead I get Thu Jan 15 23 11 56 IRST 1970   How should it be done

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tl dr  Instant ofEpochSecond  1 280 512 800L        2010-07-30T18 00 00Z   java time  The new java time framework built into Java 8 and later is the successor to Joda-Time    These new classes include a handy factory method to convert a count of whole seconds from epoch  You get an Instant  a moment on the timeline in UTC with up to nanoseconds resolution   Instant instant   Instant ofEpochSecond  1 280 512 800L         instant toString    2010-07-30T18 00 00Z   See that code run live at IdeOne com     Asia Kabul or Asia Tehran time zones    You reported getting a time-of-day value of 22 30 instead of the 18 00 seen here  I suspect your PHP utility is implicitly applying a default time zone to adjust from UTC  My value here is UTC  signified by the Z  short for Zulu  means UTC   Any chance your machine OS or PHP is set to Asia Kabul or Asia Tehran time zones  I suppose so as you report IRST in your output which apparently means Iran time  Currently in 2017 those are the only zones operating with a summer time that is four and a half hours ahead of UTC   Specify a proper time zone name in the format of continent region  such as America Montreal  Africa Casablanca  or Pacific Auckland  Never use the 3-4 letter abbreviation such as EST or IST or IRST as they are not true time zones  not standardized  and not even unique       If you want to see your moment through the lens of a particular region s time zone  apply a ZoneId to get a ZonedDateTime  Still the same simultaneous moment  but seen as a different wall-clock time   ZoneId z   ZoneId of   Asia Tehran      ZonedDateTime zdt   instant atZone  z        Same moment  same point on timeline  but seen as different wall-clock time       2010-07-30T22 30 04 30 Asia Tehran    Converting from java time to legacy classes  You should stick with the new java time classes  But you can convert to old if required   java util Date date   java util Date from  instant      Joda-Time  UPDATE  The Joda-Time project is now in maintenance mode  with the team advising migration to the java time classes    FYI  the constructor for a Joda-Time DateTime is similar  Multiply by a thousand to produce a long  not an int     DateTime dateTime   new DateTime    1 280 512 800L   1000 L    DateTimeZone forID   Europe Paris         Best to avoid the notoriously troublesome java util Date and  Calendar classes  But if you must use a Date  you can convert from Joda-Time   java util Date date   dateTime toDate        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   The Joda-Time project  now in maintenance mode  advises migration to the java time classes   To learn more  see the Oracle Tutorial  And search Stack Overflow for many examples and explanations  Specification is JSR 310   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   Where to obtain the java time classes     Java SE 8  Java SE 9  and later   Built-in   Part of the standard Java API with a bundled implementation  Java 9 adds some minor features and fixes   Java SE 6 and Java SE 7   Much of the java time functionality is back-ported to Java 6  amp  7 in ThreeTen-Backport   Android   Later versions of Android bundle implementations of the java time classes  For earlier Android   lt 26   the ThreeTenABP project adapts ThreeTen-Backport  mentioned above   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

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Date d   new Date i   1000   TimeZone getDefault   getRawOffset

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java time  Java 8 introduced a new API for working with dates and times  the java time package   With java time you can parse your count of whole seconds since the epoch reference of first moment of 1970 in UTC  1970-01-01T00 00Z  The result is an Instant   Instant instant   Instant ofEpochSecond  timeStamp      If you need a java util Date to interoperate with old code not yet updated for java time  convert  Call new conversion methods added to the old classes    Date date   Date from  instant

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Looks like Calendar is the new way to go   Calendar mydate   Calendar getInstance    mydate setTimeInMillis timestamp 1000   out println mydate get Calendar DAY OF MONTH      mydate get Calendar MONTH      mydate get Calendar YEAR      The last line is just an example how to use it  this one would print eg  14 06 2012    If you have used System currentTimeMillis   to save the Timestamp you don t need the   1000  part   If you have the timestamp in a string you need to parse it first as a long  Long parseLong timestamp    https   docs oracle com javase 7 docs api java util Calendar html

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This is the right way   Date date   new Date     date setTime  long unix time 1000

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If you are converting a timestamp value on a different machine  you should also check the timezone of that machine  For example   The above decriptions will result different Date values  if you run with EST or UTC timezones   To set the timezone  aka to UTC  you can simply rewrite       TimeZone setDefault TimeZone getTimeZone  UTC         java util Date time  new java util Date  Long parseLong timestamp  1000

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For 1280512800  multiply by 1000  since java is expecting milliseconds   java util Date time new java util Date  long timeStamp 1000     If you already had milliseconds  then just new java util Date  long timeStamp     From the documentation      Allocates a Date object and   initializes it to represent the   specified number of milliseconds since   the standard base time known as  the   epoch   namely January 1  1970    00 00 00 GMT

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Date s constructor expects the timeStamp value to be in milliseconds  Multiply your timestamp s value with 1000  then pass it to the constructor

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Sometimes you need to work with adjustments   Don t use cast to long  Use nanoadjustment   For example  using Oanda Java API for trading you can get datetime as UNIX format   For example  1592523410 590566943      System out println  instant with nano       Instant ofEpochSecond 1592523410  590566943        System out println  instant       Instant ofEpochSecond 1592523410      you get   instant with nano   2020-06-18T23 36 50 590566943Z instant   2020-06-18T23 36 50Z   Also  use    Date date   Date from  Instant ofEpochSecond 1592523410  590566943

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For kotlin  fun unixToDate timeStamp  Long    String        val time   java util Date timeStamp as Long   1000      val sdf   SimpleDateFormat  yyyy-MM-dd       return sdf format time

[java] Java: Date from unix timestamp

tl;dr

java.time

`Asia/Kabul` or `Asia/Tehran` time zones ?

Converting from java.time to legacy classes

Joda-Time

About java.time

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