Joda DateTime to Timestamp conversion

Question

I am trying to change the value of Timestamp by DateTimeZone in Joda      DateTime dt   new DateTime rs getTimestamp  anytimestampcolumn                                 DateTimeZone forID  anytimezone       Timestamp ts   new Timestamp dt getMillis        For DateTime  value is      2013-04-13T22 56 27 000 03 00 For TimeStamp  value is   2013-04-13 22 56 27 0   Timestamp is coming without timezone difference    How can i get the correct Timestamp with TimeZone    For example I want to get   2013-05-13 01 56 27 0    Thanks in advance   edit   using MySQL  column type is TIMESTAMP of course  rs is ResultSet

User · Answer

This Works just fine DateTime dt   new DateTime    Log d  ts  String valueOf dt now                     dt dt plusYears 3   dt dt minusDays 7   Log d  JODA DateTime  String valueOf dt    Timestamp ts  new Timestamp dt getMillis     Log d  Coverted to java sql Timestamp  String valueOf ts

User · Answer

It is a common misconception that time  a measurable 4th dimension  is different over the world  Timestamp as a moment in time is unique  Date however is influenced how we  see  time but actually it is  time of day    An example  two people look at the clock at the same moment  The timestamp is the same  right  But one of them is in London and sees 12 00 noon  GMT  timezone offset is 0   and the other is in Belgrade and sees 14 00  CET  Central Europe  daylight saving now  offset is  2    Their perception is different but the moment is the same   You can find more details in this answer   UPDATE  OK  it s not a duplicate of this question but it is pointless since you are confusing the terms  Timestamp   moment in time  objective   and  Date Time    time of day  subjective     Let s look at your original question code broken down like this      Get the  original  value from database  Timestamp momentFromDB   rs getTimestamp  anytimestampcolumn        Turn it into a Joda DateTime with time zone  DateTime dt   new DateTime momentFromDB  DateTimeZone forID  anytimezone         And then turn it back into a timestamp but  with time zone   Timestamp ts   new Timestamp dt getMillis       I haven t run this code but I am certain it will print true and the same number of milliseconds each time   System out println  momentFromDB    dt        momentFromDB getTime      dt getTimeInMillis     System out println  momentFromDB    ts        momentFromDB getTime      ts getTime      System out println  dt    ts        dt getTimeInMillis      ts getTime       System out println  momentFromDB  ms        momentFromDB getTime     System out println  ts  ms        ts getTime     System out println  dt  ms        dt getTimeInMillis       But as you said yourself printing them out as strings will result in  different  time because DateTime applies the time zone  That s why  time  is stored and transferred as Timestamp objects  which basically wraps a long  and displayed or entered as Date Time    In your own answer you are artificially adding an offset and creating a  wrong  time  If you use that timestamp to create another DateTime and print it out it will be offset twice      Turn it back into a Joda DateTime with time zone  DateTime dt   new DateTime ts  DateTimeZone forID  anytimezone       P S  If you have the time go through the very complex Joda Time source code to see how it holds the time  millis  and how it prints it   JUnit Test as proof  import static org junit Assert    import static org hamcrest CoreMatchers     import java text SimpleDateFormat  import java util Calendar  import java util Date  import java util Locale  import java util TimeZone   import org junit Before  import org junit Test    public class WorldTimeTest       private static final int MILLIS IN HOUR   1000   60   60      private static final String ISO FORMAT NO TZ    yyyy-MM-dd T HH mm ss SSS       private static final String ISO FORMAT WITH TZ    yyyy-MM-dd T HH mm ss SSSXXX        private TimeZone londonTimeZone      private TimeZone newYorkTimeZone      private TimeZone sydneyTimeZone      private long nowInMillis      private Date now       public static SimpleDateFormat createDateFormat String pattern  TimeZone timeZone  throws Exception           SimpleDateFormat result   new SimpleDateFormat pattern              Must explicitly set the time zone with  setCalendar             result setCalendar Calendar getInstance timeZone            return result             public static SimpleDateFormat createDateFormat String pattern  throws Exception           return createDateFormat pattern  TimeZone getDefault                public static SimpleDateFormat createDateFormat   throws Exception           return createDateFormat ISO FORMAT WITH TZ  TimeZone getDefault                public void printSystemInfo   throws Exception           final String   propertyNames                      java runtime name    java runtime version    java vm name    java vm version                    os name    os version    os arch                    user language    user country    user script    user variant                    user language format    user country format    user script format                    user timezone              System out println            System out println  System Information             for  String name   propertyNames                if  name    null    name length      0                    continue                            String value   System getProperty name               if  value    null  amp  amp  value length    gt  0                    System out println        name           value                                    final TimeZone defaultTZ   TimeZone getDefault            final int defaultOffset   defaultTZ getOffset nowInMillis    MILLIS IN HOUR          final int userOffset   TimeZone getTimeZone System                  getProperty  user timezone    getOffset nowInMillis    MILLIS IN HOUR          final Locale defaultLocale   Locale getDefault             System out println    default timezone-offset  hours        userOffset           System out println    default timezone       defaultTZ getDisplayName             System out println    default timezone id       defaultTZ getID             System out println    default timezone-offset  hours        defaultOffset           System out println    default locale                       defaultLocale getLanguage           defaultLocale getCountry                            defaultLocale getDisplayLanguage                           defaultLocale getDisplayCountry                   System out println    now       nowInMillis      ms  or                     createDateFormat   format now            System out println                Before     public void setUp   throws Exception              Remember this moment          now   new Date            nowInMillis   now getTime          System currentTimeMillis                Print out some system information          printSystemInfo                 Europe London  time zone is DST aware  we ll use fixed offset          londonTimeZone   TimeZone getTimeZone  GMT               The same applies to  America New York  time zone             newYorkTimeZone   TimeZone getTimeZone  GMT-5                   and for the  Australia Sydney  time zone          sydneyTimeZone   TimeZone getTimeZone  GMT 10                Test     public void testDateFormatting   throws Exception           int londonOffset   londonTimeZone getOffset nowInMillis    MILLIS IN HOUR     in hours         Calendar londonCalendar   Calendar getInstance londonTimeZone           londonCalendar setTime now            int newYorkOffset   newYorkTimeZone getOffset nowInMillis    MILLIS IN HOUR          Calendar newYorkCalendar   Calendar getInstance newYorkTimeZone           newYorkCalendar setTime now            int sydneyOffset   sydneyTimeZone getOffset nowInMillis    MILLIS IN HOUR          Calendar sydneyCalendar   Calendar getInstance sydneyTimeZone           sydneyCalendar setTime now               Check each time zone offset          assertThat londonOffset  equalTo 0            assertThat newYorkOffset  equalTo -5            assertThat sydneyOffset  equalTo 10                Check that calendars are not equals  due to time zone difference           assertThat londonCalendar  not equalTo newYorkCalendar             assertThat londonCalendar  not equalTo sydneyCalendar                 Check if they all point to the same moment in time  in milliseconds          assertThat londonCalendar getTimeInMillis    equalTo nowInMillis            assertThat newYorkCalendar getTimeInMillis    equalTo nowInMillis            assertThat sydneyCalendar getTimeInMillis    equalTo nowInMillis                Check if they all point to the same moment in time  as Date          assertThat londonCalendar getTime    equalTo now            assertThat newYorkCalendar getTime    equalTo now            assertThat sydneyCalendar getTime    equalTo now                Check if hours are all different  skip local time because            this test could be executed in those exact time zones           assertThat newYorkCalendar get Calendar HOUR OF DAY                   not equalTo londonCalendar get Calendar HOUR OF DAY              assertThat sydneyCalendar get Calendar HOUR OF DAY                   not equalTo londonCalendar get Calendar HOUR OF DAY                   Display London time in multiple forms          SimpleDateFormat dfLondonNoTZ   createDateFormat ISO FORMAT NO TZ  londonTimeZone           SimpleDateFormat dfLondonWithTZ   createDateFormat ISO FORMAT WITH TZ  londonTimeZone           System out println  London      londonTimeZone getDisplayName false  TimeZone SHORT                           londonOffset                  System out println    time  ISO format w o TZ                        dfLondonNoTZ format londonCalendar getTime              System out println    time  ISO format w  TZ                         dfLondonWithTZ format londonCalendar getTime              System out println    time  default format                           londonCalendar getTime             londonCalendar toString                Using system default time zone          System out println    time  default TZ                               createDateFormat ISO FORMAT NO TZ  format londonCalendar getTime                              createDateFormat   format londonCalendar getTime                   Display New York time in multiple forms          SimpleDateFormat dfNewYorkNoTZ   createDateFormat ISO FORMAT NO TZ  newYorkTimeZone           SimpleDateFormat dfNewYorkWithTZ   createDateFormat ISO FORMAT WITH TZ  newYorkTimeZone           System out println  New York      newYorkTimeZone getDisplayName false  TimeZone SHORT                           newYorkOffset                  System out println    time  ISO format w o TZ                        dfNewYorkNoTZ format newYorkCalendar getTime              System out println    time  ISO format w  TZ                         dfNewYorkWithTZ format newYorkCalendar getTime              System out println    time  default format                           newYorkCalendar getTime             newYorkCalendar toString                Using system default time zone          System out println    time  default TZ                               createDateFormat ISO FORMAT NO TZ  format newYorkCalendar getTime                              createDateFormat   format newYorkCalendar getTime                   Display Sydney time in multiple forms          SimpleDateFormat dfSydneyNoTZ   createDateFormat ISO FORMAT NO TZ  sydneyTimeZone           SimpleDateFormat dfSydneyWithTZ   createDateFormat ISO FORMAT WITH TZ  sydneyTimeZone           System out println  Sydney      sydneyTimeZone getDisplayName false  TimeZone SHORT                           sydneyOffset                  System out println    time  ISO format w o TZ                        dfSydneyNoTZ format sydneyCalendar getTime              System out println    time  ISO format w  TZ                         dfSydneyWithTZ format sydneyCalendar getTime              System out println    time  default format                           sydneyCalendar getTime             sydneyCalendar toString                Using system default time zone          System out println    time  default TZ                               createDateFormat ISO FORMAT NO TZ  format sydneyCalendar getTime                              createDateFormat   format sydneyCalendar getTime                  Test     public void testDateParsing   throws Exception              Create date parsers that look for time zone information in a date-time string          final SimpleDateFormat londonFormatTZ   createDateFormat ISO FORMAT WITH TZ  londonTimeZone           final SimpleDateFormat newYorkFormatTZ   createDateFormat ISO FORMAT WITH TZ  newYorkTimeZone           final SimpleDateFormat sydneyFormatTZ   createDateFormat ISO FORMAT WITH TZ  sydneyTimeZone               Create date parsers that ignore time zone information in a date-time string          final SimpleDateFormat londonFormatLocal   createDateFormat ISO FORMAT NO TZ  londonTimeZone           final SimpleDateFormat newYorkFormatLocal   createDateFormat ISO FORMAT NO TZ  newYorkTimeZone           final SimpleDateFormat sydneyFormatLocal   createDateFormat ISO FORMAT NO TZ  sydneyTimeZone               We are looking for the moment this millenium started  the famous Y2K             when at midnight everyone welcomed the New Year 2000  i e  2000-01-01 00 00 00             Which of these is the right one             a   2000-01-01T00 00 00 000-00 00             b   2000-01-01T00 00 00 000-05 00             c   2000-01-01T00 00 00 000 10 00             None of them  All of them             For those who guessed it - yes  it is a trick question because we didn t specify            the  where  part  or what kind of time  local global  we are looking for             The first  a  is the local Y2K moment in London  which is at the same time global             The second  b  is the local Y2K moment in New York  but London is already celebrating for 5 hours             The third  c  is the local Y2K moment in Sydney  and they started celebrating 15 hours before New York did             The point here is that each answer is correct because everyone thinks of that moment in terms of  celebration at midnight              The key word here is  midnight   That moment is actually a  time of day  moment illustrating our perception of time based on the movement of our Sun              These are global Y2K moments  i e  the same moment all over the world  UTC GMT midnight          final String MIDNIGHT GLOBAL    2000-01-01T00 00 00 000-00 00           final Date milleniumInLondon   londonFormatTZ parse MIDNIGHT GLOBAL           final Date milleniumInNewYork   newYorkFormatTZ parse MIDNIGHT GLOBAL           final Date milleniumInSydney   sydneyFormatTZ parse MIDNIGHT GLOBAL               Check if they all point to the same moment in time             And that parser ignores its own configured time zone and uses the information from the date-time string          assertThat milleniumInNewYork  equalTo milleniumInLondon            assertThat milleniumInSydney  equalTo milleniumInLondon                 These are all local Y2K moments  a k a  midnight at each location on Earth  with time zone information          final String MIDNIGHT LONDON    2000-01-01T00 00 00 000-00 00           final String MIDNIGHT NEW YORK    2000-01-01T00 00 00 000-05 00           final String MIDNIGHT SYDNEY    2000-01-01T00 00 00 000 10 00           final Date midnightInLondonTZ   londonFormatLocal parse MIDNIGHT LONDON           final Date midnightInNewYorkTZ   newYorkFormatLocal parse MIDNIGHT NEW YORK           final Date midnightInSydneyTZ   sydneyFormatLocal parse MIDNIGHT SYDNEY               Check if they all point to the same moment in time          assertThat midnightInNewYorkTZ  not equalTo midnightInLondonTZ             assertThat midnightInSydneyTZ  not equalTo midnightInLondonTZ                 Check if the time zone offset is correct          assertThat midnightInLondonTZ getTime   - midnightInNewYorkTZ getTime                    equalTo  long  newYorkTimeZone getOffset milleniumInLondon getTime               assertThat midnightInLondonTZ getTime   - midnightInSydneyTZ getTime                    equalTo  long  sydneyTimeZone getOffset milleniumInLondon getTime                    These are also local Y2K moments  just withouth the time zone information          final String MIDNIGHT ANYWHERE    2000-01-01T00 00 00 000           final Date midnightInLondon   londonFormatLocal parse MIDNIGHT ANYWHERE           final Date midnightInNewYork   newYorkFormatLocal parse MIDNIGHT ANYWHERE           final Date midnightInSydney   sydneyFormatLocal parse MIDNIGHT ANYWHERE               Check if these are the same as the local moments with time zone information          assertThat midnightInLondon  equalTo midnightInLondonTZ            assertThat midnightInNewYork  equalTo midnightInNewYorkTZ            assertThat midnightInSydney  equalTo midnightInSydneyTZ                Check if they all point to the same moment in time          assertThat midnightInNewYork  not equalTo midnightInLondon             assertThat midnightInSydney  not equalTo midnightInLondon                 Check if the time zone offset is correct          assertThat midnightInLondon getTime   - midnightInNewYork getTime                    equalTo  long  newYorkTimeZone getOffset milleniumInLondon getTime               assertThat midnightInLondon getTime   - midnightInSydney getTime                    equalTo  long  sydneyTimeZone getOffset milleniumInLondon getTime                    Final check - if Y2K moment is in London            final String Y2K LONDON    2000-01-01T00 00 00 000Z                 New York local time would be still 5 hours in 1999            final String Y2K NEW YORK    1999-12-31T19 00 00 000-05 00                 and Sydney local time would be 10 hours in 2000          final String Y2K SYDNEY    2000-01-01T10 00 00 000 10 00            final String londonTime   londonFormatTZ format milleniumInLondon           final String newYorkTime   newYorkFormatTZ format milleniumInLondon           final String sydneyTime   sydneyFormatTZ format milleniumInLondon               WHat do you think  will the test pass          assertThat londonTime  equalTo Y2K LONDON            assertThat newYorkTime  equalTo Y2K NEW YORK            assertThat sydneyTime  equalTo Y2K SYDNEY

User · Answer

Actually this is not a  duplicate question  And this how i solve my problem after several times       int offset   DateTimeZone forID  anytimezone   getOffset new DateTime       This is the way to get offset from desired timezone    Let s return to our code  we were getting timestamp from a result set of query  and using it with timezone to create our datetime       DateTime dt   new DateTime rs getTimestamp  anytimestampcolumn                             DateTimeZone forID  anytimezone       Now we will add our offset to the datetime  and get the timestamp from it       dt   dt plusMillis offset       Timestamp ts   new Timestamp dt getMillis       May be this is not the actual way to get it  but it solves my case  I hope it helps anyone who is stuck here

User · Answer

I ve solved this problem in this way   String dateUTC   rs getString  date      UTC DateTime date  DateTimeFormatter dateTimeFormatter   DateTimeFormat forPattern  yyyy-MM-dd HH mm ss SSS   withZoneUTC    date   dateTimeFormatter parseDateTime dateUTC     In this way you ignore the server TimeZone forcing your chosen TimeZone

[java] Joda DateTime to Timestamp conversion

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