String date to xmlgregoriancalendar conversion

Question

I have written this function    public static XMLGregorianCalendar getXMLGregorianCalendar String date  throws OmniException      XMLGregorianCalendar xmlCalender null      GregorianCalendar calender   new GregorianCalendar        calender setTime Util stringToJavaDate date        xmlCalender   DatatypeFactory newInstance   newXMLGregorianCalendar calender       return xmlCalender     public static Date  stringToJavaDate String sDate   throws OmniException      Date date null      date   new SimpleDateFormat  yyyy-MM-dd HH mm ss   Locale ENGLISH  parse sDate               return date        When i am passing date as  2014-01-07  am getting output date as 2014-01-06T18 30 00 000Z where i am going wrong   also what to do if I want to get only 2014-01-06T18 30 00 and 2014-01-06T18 30 00Z Any help is appreciated

User · Answer

For me the most elegant solution is this one:

XMLGregorianCalendar result = DatatypeFactory.newInstance()
    .newXMLGregorianCalendar("2014-01-07");

Using Java 8.

Extended example:

XMLGregorianCalendar result = DatatypeFactory.newInstance()
    .newXMLGregorianCalendar("2014-01-07");
System.out.println(result.getDay());
System.out.println(result.getMonth());
System.out.println(result.getYear());

This prints out:

7
1
2014

User · Answer

GregorianCalendar c   GregorianCalendar from  LocalDate parse  2016-06-22    atStartOfDay ZoneId systemDefault      XMLGregorianCalendar date2   DatatypeFactory newInstance   newXMLGregorianCalendar c

User · Answer

Found the solution as below     posting it as it could help somebody else too     DateFormat format   new SimpleDateFormat  yyyy-MM-dd hh mm ss    Date date   format parse  2014-04-24 11 15 00     GregorianCalendar cal   new GregorianCalendar    cal setTime date    XMLGregorianCalendar xmlGregCal    DatatypeFactory newInstance   newXMLGregorianCalendar cal    System out println xmlGregCal     Output   2014-04-24T11 15 00 000 02 00

User · Answer

tl dr   Use modern java time classes as much as possible  rather than the terrible legacy classes   Always specify your desired expected time zone or offset-from-UTC rather than rely implicitly on JVM   s current default    Example code  without exception-handling    XMLGregorianCalendar xgc        DatatypeFactory                              Data-type converter       newInstance                                 Instantiate a converter object       newXMLGregorianCalendar                     Converter going from  GregorianCalendar  to  XMLGregorianCalendar           GregorianCalendar from                   Convert from modern  ZonedDateTime  class to legacy  GregorianCalendar  class              LocalDate                            Modern class for representing a date-only  without time-of-day and without time zone               parse   2014-01-07                  Parsing strings in standard ISO 8601 format is handled by default  with no need for custom formatting pattern                atStartOfDay  ZoneOffset UTC        Determine the first moment of the day as seen in UTC  Returns a  ZonedDateTime  object                                                   Returns a  GregorianCalendar  object                                                   Returns a  XMLGregorianCalendar  object      Parsing date-only input string into an object of XMLGregorianCalendar class  Avoid the terrible legacy date-time classes whenever possible  such as XMLGregorianCalendar  GregorianCalendar  Calendar  and Date  Use only modern java time classes   When presented with a string such as  2014-01-07   parse as a LocalDate   LocalDate parse   2014-01-07      To get a date with time-of-day  assuming you want the first moment of the day  specify a time zone  Let java time determine the first moment of the day  as it is not always 00 00 00 0 in some zones on some dates   LocalDate parse   2014-01-07              atStartOfDay  ZoneId of   America Montreal        This returns a ZonedDateTime object    ZonedDateTime zdt            LocalDate          parse   2014-01-07             atStartOfDay  ZoneId of   America Montreal             zdt toString     2014-01-07T00 00-05 00 America Montreal    But apparently  you want the start-of-day as seen in UTC  an offset of zero hours-minutes-seconds   So we specify ZoneOffset UTC constant as our ZoneId argument    ZonedDateTime zdt            LocalDate          parse   2014-01-07             atStartOfDay  ZoneOffset UTC          zdt toString     2014-01-07T00 00Z   The Z on the end means UTC  an offset of zero   and is pronounced    Zulu       If you must work with legacy classes  convert to GregorianCalendar  a subclass of Calendar    GregorianCalendar gc   GregorianCalendar from  zdt          gc toString     java util GregorianCalendar time 1389052800000 areFieldsSet true areAllFieldsSet true lenient true zone sun util calendar ZoneInfo id  UTC  offset 0 dstSavings 0 useDaylight false transitions 0 lastRule null  firstDayOfWeek 2 minimalDaysInFirstWeek 4 ERA 1 YEAR 2014 MONTH 0 WEEK OF YEAR 2 WEEK OF MONTH 2 DAY OF MONTH 7 DAY OF YEAR 7 DAY OF WEEK 3 DAY OF WEEK IN MONTH 1 AM PM 0 HOUR 0 HOUR OF DAY 0 MINUTE 0 SECOND 0 MILLISECOND 0 ZONE OFFSET 0 DST OFFSET 0    Apparently  you really need an object of the legacy class XMLGregorianCalendar  If the calling code cannot be updated to use java time  convert   XMLGregorianCalendar xgc            DatatypeFactory          newInstance            newXMLGregorianCalendar  gc        Actually  that code requires a try-catch   try       XMLGregorianCalendar xgc               DatatypeFactory                      newInstance                        newXMLGregorianCalendar  gc      catch   DatatypeConfigurationException e         e printStackTrace           xgc   2014-01-07T00 00 00 000Z   Putting that all together  with appropriate exception-handling      Given an input string such as  2014-01-07   return a  XMLGregorianCalendar  object    representing first moment of the day on that date as seen in UTC   static public XMLGregorianCalendar getXMLGregorianCalendar   String input         Objects requireNonNull  input        if  input isBlank       throw new IllegalArgumentException   Received empty blank input string for date argument  Message   11818896-7412-49ba-8f8f-9b3053690c5d             XMLGregorianCalendar xgc   null      ZonedDateTime zdt   null       try               zdt                   LocalDate                          parse  input                            atStartOfDay  ZoneOffset UTC              catch   DateTimeParseException e                 throw new IllegalArgumentException   Faulty input string for date does not comply with standard ISO 8601 format  Message   568db0ef-d6bf-41c9-8228-cc3516558e68                 GregorianCalendar gc   GregorianCalendar from  zdt        try               xgc                   DatatypeFactory                          newInstance                            newXMLGregorianCalendar  gc              catch   DatatypeConfigurationException e                 e printStackTrace               Objects requireNonNull  xgc        return xgc       Usage   String input    2014-01-07   XMLGregorianCalendar xgc   App getXMLGregorianCalendar  input      Dump to console   System out println   xgc       xgc         xgc   2014-01-07T00 00 00 000Z   Modern date-time classes versus legacy    Date-time    String  Do not conflate a date-time value with its textual representation  We parse strings to get a date-time object  and we ask the date-time object to generate a string to represent its value  The date-time object has no    format     only strings have a format   So shift your thinking into two separate modes  model and presentation  Determine the date-value you have in mind  applying appropriate time zone  as the model  When you need to display that value  generate a string in a particular format as expected by the user   Avoid legacy date-time classes  The Question and other Answers all use old troublesome date-time classes now supplanted by the java time classes   ISO 8601  Your input string  2014-01-07  is in standard ISO 8601 format   The T in the middle separates date portion from time portion   The Z on the end is short for Zulu and means UTC   Fortunately  the java time classes use the ISO 8601 formats by default when parsing generating strings  So no need to specify a formatting pattern   LocalDate  The LocalDate class represents a date-only value without time-of-day and without time zone   LocalDate ld   LocalDate parse   2014-01-07           ld toString    2014-01-07   Start of day ZonedDateTime  If you want to see the first moment of that day  specify a ZoneId time zone to get a moment on the timeline  a ZonedDateTime  The time zone is crucial because the date varies around the globe by zone  A few minutes after midnight in Paris France is a new day while still    yesterday    in Montr  al Qu  bec   Never assume the day begins at 00 00 00  Anomalies such as Daylight Saving Time  DST  means the day may begin at another time-of-day such as 01 00 00  Let java time determine the first moment   ZoneId z   ZoneId of   America Montreal      ZonedDateTime zdt   ld atStartOfDay  z          zdt toString    2014-01-07T00 00 00Z   For your desired format  generate a string using the predefined formatter DateTimeFormatter ISO LOCAL DATE TIME and then replace the T in the middle with a SPACE   String output   zdt format  DateTimeFormatter ISO LOCAL DATE TIME                       replace   T                  2014-01-07 00 00 00     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   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   The ThreeTenABP project adapts ThreeTen-Backport  mentioned above  for Android specifically  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] String date to xmlgregoriancalendar conversion

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