how to convert string into time format and add two hours

Question

I have the following requirement in the project   I have a input field by name startDate and user enters in the format YYYY-MM-DD HH MM SS  I need to add two hours for the user input in the startDate field  how can i do it   Thanks in advance

User · Answer

Try this one  I test it  working fine  Date date   null  String str    2012 07 25 12 00 00   DateFormat formatter   new SimpleDateFormat  yyyy MM dd HH mm ss    date   formatter parse str   Calendar calendar   Calendar getInstance    calendar setTime date   calendar add Calendar HOUR  2   System out println calendar getTime         Output   Wed Jul 25 14 00 00 IST 2012   If you want to convert in your input type than add this code also  formatter   new SimpleDateFormat  yyyy-MM-dd HH mm ss    str formatter format calendar getTime     System out println str       Output   2012-07-25 14 00 00

User · Answer

tl dr  LocalDateTime parse        2018-01-23 01 23 45  replace         T        plusHours  2     java time  The modern approach uses the java time classes added to Java 8  Java 9  and later      user enters in the format YYYY-MM-DD HH MM SS   Parse that input string into a date-time object  Your format is close to complying with standard ISO 8601 format  used by default in the java time classes for parsing generating strings  To fully comply  replace the SPACE in the middle with a T   String input    2018-01-23 01 23 45  replace         T         Yields  2018-01-23T01 23 45   Parse as a LocalDateTime given that your input lacks any indicator of time zone or offset-from-UTC   LocalDateTime ldt   LocalDateTime parse  input          add two hours   The java time classes can do the math for you   LocalDateTime twoHoursLater   ldt plusHours  2       Time Zone  Be aware that a LocalDateTime does not represent a moment  a point on the timeline  Without the context of a time zone or offset-from-UTC  it has no real meaning  The    Local    part of the name means any locality or no locality  rather than any one particular locality  Just saying  noon on Jan 21st  could mean noon in Auckland  New Zealand which happens several hours earlier than noon in Paris France   To define an actual moment  you must specify a zone or offset    ZoneId z   ZoneId of   Africa Tunis      ZonedDateTime zdt   ldt atZone  z         Define an actual moment  a point on the timeline by giving a context with time zone    If you know the intended time zone for certain  apply it before adding the two hours  The LocalDateTime class assumes simple generic 24-hour days when doing the math  But in various time zones on various dates  days may be 23 or 25 hours long  or may be other lengths  So  for correct results in a zoned context  add the hours to your ZonedDateTime rather than LocalDateTime      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   Later versions of Android bundle implementations of the java time classes  For earlier Android  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

User · Answer

Being a fan of the Joda Time library  here s how you can do it that way using a Joda DateTime   import org joda time format    import org joda time              String dateString    2009-04-17 10 41 33       parse the string DateTimeFormatter formatter   DateTimeFormat forPattern  yyyy-MM-dd HH mm ss    DateTime dateTime   formatter parseDateTime dateString       add two hours dateTime   dateTime plusHours 2      easier than mucking about with Calendar and constants  System out println dateTime     If you still need to use java util Date objects before after this conversion  the Joda DateTime API provides some easy toDate   and toCalendar   methods for easy translation   The Joda API provides so much more in the way of convenience over the Java Date Calendar API

User · Answer

the parsed time zone offset  DateTimeFormatter dateFormat   DateTimeFormat forPattern  yyyy-MM-dd T HH mm ss SSSZ    String fromDateTimeObj    2011-01-03T12 00 00 000-0800   DateTime fromDatetime   dateFormat withOffsetParsed   parseDateTime fromDateTimeObj

User · Answer

Use the SimpleDateFormat class parse   method  This method will return a Date object  You can then create a Calendar object for this Date and add 2 hours to it   SimpleDateFormat formatter   new SimpleDateFormat  yyyy-MM-dd HH mm ss    Date date   formatter parse theDateToParse   Calendar cal   Calendar getInstance    cal setTime date   cal add Calendar HOUR OF DAY  2   cal getTime       This will give you the time you want

User · Answer

You can use SimpleDateFormat to convert the String to Date  And after that you have two options    Make a Calendar object and and then use that to add two hours  or get the time in millisecond from that date object  and add two hours like   2   60   60   1000   SimpleDateFormat df   new SimpleDateFormat  yyyy-MM-dd HH mm ss        replace with your start date string Date d   df parse  2008-04-16 00 05 05     Calendar gc   new GregorianCalendar    gc setTime d   gc add Calendar HOUR  2   Date d2   gc getTime      Or   SimpleDateFormat df   new SimpleDateFormat  yyyy-MM-dd HH mm ss        replace with your start date string Date d   df parse  2008-04-16 00 05 05    Long time   d getTime    time    2 60 60 1000   Date d2   new Date time      Have a look to these tutorials    SimpleDateFormat Tutorial Calendar Tutorial

User · Answer

This will give you the time you want  eg  21 31 PM     Add 2 Hours to just TIME SimpleDateFormat formatter   new SimpleDateFormat  HH mm ss a    Date date2   formatter parse  19 31 51 PM    Calendar cal2   Calendar getInstance    cal2 setTime date2   cal2 add Calendar HOUR OF DAY  2   SimpleDateFormat printTimeFormat   new SimpleDateFormat  HH mm a    System out println printTimeFormat format cal2 getTime

User · Answer

This example is a  Sum for Date time and Time Zone String Values   String DateVal    2015-03-26 12 00 00   String TimeVal    02 00 00    SimpleDateFormat sdf   new SimpleDateFormat  yyyy-MM-dd HH mm ss    SimpleDateFormat sdf2   new SimpleDateFormat  HH mm ss     Date reslt   sdf parse  DateVal    Date timeZ   sdf2 parse  TimeVal      Increase Date Time reslt setHours  reslt getHours     timeZ getHours     reslt setMinutes  reslt getMinutes     timeZ getMinutes     reslt setSeconds  reslt getSeconds     timeZ getSeconds      System printLn out  sdf format reslt      Result  2 Hours    2015-03-26 14 00 00    Thanks

User · Answer

Basic program of adding two times   You can modify hour min sec as per your need using if else   This program shows you how you can add values from two objects and return in another object   class demo  private int hour min sec      void input int hour int min int sec       this hour hour      this min min      this sec sec             demo add demo d2   demo  because we are returning object         demo obj new demo        obj hour hour d2 hour      obj min min d2 min      obj sec sec d2 sec      return obj   Returning object and later on it gets allocated to demo d3                               void display                 System out println hour     min     sec             public static  void main String args                  demo d1 new demo            demo d2 new demo            d1 input 2  5  10           d2 input 3  3  3           demo d3 d1 add d2    Note another object is created         d3 display                 Modified Time Addition Program     class demo   private int hour min sec      void input int hour int min int sec       this hour  hour gt 12 amp  amp hour lt 24   hour-12  hour      this min  min gt 60  0 min      this sec  sec gt 60  0 sec             demo add demo d2          demo obj new demo        obj hour hour d2 hour      obj min min d2 min      obj sec sec d2 sec      if obj sec gt 60       obj sec- 60          obj min              if obj min gt 60          obj min- 60          obj hour                  return obj            void display                 System out println hour     min     sec             public static  void main String args                  demo d1 new demo            demo d2 new demo            d1 input 12  55  55           d2 input 12  7  6           demo d3 d1 add d2           d3 display

[java] how to convert string into time format and add two hours

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