Changing Java Date one hour back

Question

I have a Java date object   Date currentDate   new Date      This will give the current date and time  Example   Thu Jan 12 10 17 47 GMT 2012   Instead  I want to get the date  changing it to one hour back so it should give me   Thu Jan 12 09 17 47 GMT 2012   What would be the best way to do it

User · Answer

This can be achieved using java util Date  The following code will subtract 1 hour from your date   Date date   new Date yourdate in date format   Date newDate   DateUtils addHours date  -1    Similarly for subtracting 20 seconds from your date  newDate   DateUtils addSeconds date  -20

User · Answer

To subtract hours  you need to use the HOUR OF DAY constant  Within that  include the number with the negative sign  This would be the hours you want to reduce  All this is done under the Calendar add   method  The following is an example  import java util Calendar  public class Example     public static void main String   args       Calendar c   Calendar getInstance         System out println  quot Date    quot    c getTime               2 hours subtracted    c add Calendar HOUR OF DAY  -2      System out println  quot After subtracting 2 hrs    quot    c getTime           Here is the output  Date   Sun Dec 16 16 28 53 UTC 2018 After subtracting 2 hrs   Sun Dec 16 14 28 53 UTC 2018

User · Answer

It worked for me instead using format  To work with time just use parse and toString   methods  String localTime  6 11   LocalTime localTime   LocalTime parse localtime   LocalTime lt   6 11  localTime   lt toString

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Or using the famous Joda Time library   DateTime dateTime   new DateTime    dateTime   dateTime minusHours 1   Date modifiedDate   dateTime toDate

User · Answer

Just subtract the number of milliseconds in an hour from the date   currentDate setTime currentDate getTime   - 3600   1000

User · Answer

Similar to  Sumit Jain s solution  Date currentDate   new Date System currentTimeMillis   - 3600   1000     or  Date currentDate   new Date System currentTimeMillis   - TimeUnit HOURS toMillis 1

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Use Calendar   Calendar cal   Calendar getInstance     cal setTime new Date     cal set Calendar HOUR  cal get Calendar HOUR  - 1

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tl dr  In UTC   Instant now   minus  1   ChronoUnit HOURS      Or  zoned   Instant now           atZone  ZoneId of    America Montreal              minusHours  1     Using java time  Java 8 and later has the new java time framework built-in   Instant  If you only care about UTC  GMT   then use the Instant class   Instant instant   Instant now     Instant instantHourEarlier   instant minus   1   ChronoUnit HOURS      Dump to console   System out println    instant      instant       instantHourEarlier      instantHourEarlier         instant  2015-10-29T00 37 48 921Z   instantHourEarlier  2015-10-28T23 37 48 921Z   Note how in this instant happened to skip back to yesterday   s date   ZonedDateTime  If you care about a time zone  use the ZonedDateTime class  You can start with an Instant and the assign a time zone  a ZoneId object  This class handles the necessary adjustments for anomalies such as Daylight Saving Time  DST    Instant instant   Instant now     ZoneId zoneId   ZoneId of    America Montreal     ZonedDateTime zdt   ZonedDateTime ofInstant   instant   zoneId    ZonedDateTime zdtHourEarlier   zdt minus   1   ChronoUnit HOURS      Dump to console   System out println    instant      instant     nzdt      zdt     nzdtHourEarlier      zdtHourEarlier         instant  2015-10-29T00 50 30 778Z      zdt  2015-10-28T20 50 30 778-04 00 America Montreal       zdtHourEarlier  2015-10-28T19 50 30 778-04 00 America Montreal    Conversion  The old java util Date  Calendar classes are now outmoded  Avoid them  They are notoriously troublesome and confusing    When you must use the old classes for operating with old code not yet updated for the java time types  call the conversion methods  Here is example code going from an Instant or a ZonedDateTime to a java util Date   java util Date date   java util Date from  instant         or     java util Date date   java util Date from  zdt toInstant          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  Java SE 10  Java SE 11  and later  - 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   Most 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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You can use from bellow code for date and time    DateFormat dateFormat   new SimpleDateFormat  yyyy MM dd HH mm ss             get current date time with Calendar          Calendar cal   Calendar getInstance           System out println  Current Date Time       dateFormat format cal getTime              cal add Calendar DATE  1          System out println  Add one day to current date       dateFormat format cal getTime              cal   Calendar getInstance           cal add Calendar MONTH  1          System out println  Add one month to current date       dateFormat format cal getTime              cal   Calendar getInstance           cal add Calendar YEAR  1          System out println  Add one year to current date       dateFormat format cal getTime              cal   Calendar getInstance           cal add Calendar HOUR  1          System out println  Add one hour to current date       dateFormat format cal getTime              cal   Calendar getInstance           cal add Calendar MINUTE  1          System out println  Add one minute to current date       dateFormat format cal getTime              cal   Calendar getInstance           cal add Calendar SECOND  1          System out println  Add one second to current date       dateFormat format cal getTime              cal   Calendar getInstance           cal add Calendar DATE  -1          System out println  Subtract one day from current date       dateFormat format cal getTime              cal   Calendar getInstance           cal add Calendar MONTH  -1          System out println  Subtract one month from current date       dateFormat format cal getTime              cal   Calendar getInstance           cal add Calendar YEAR  -1          System out println  Subtract one year from current date       dateFormat format cal getTime              cal   Calendar getInstance           cal add Calendar HOUR  -1          System out println  Subtract one hour from current date       dateFormat format cal getTime              cal   Calendar getInstance           cal add Calendar MINUTE  -1          System out println  Subtract one minute from current date       dateFormat format cal getTime              cal   Calendar getInstance           cal add Calendar SECOND  -1          System out println  Subtract one second from current date       dateFormat format cal getTime        Output    Current Date Time   2008 12 28 10 24 53 Add one day to current date   2008 12 29 10 24 53 Add one month to current date   2009 01 28 10 24 53 Add one year to current date   2009 12 28 10 24 53 Add one hour to current date   2008 12 28 11 24 53 Add one minute to current date   2008 12 28 10 25 53 Add one second to current date   2008 12 28 10 24 54 Subtract one day from current date   2008 12 27 10 24 53 Subtract one month from current date   2008 11 28 10 24 53 Subtract one year from current date   2007 12 28 10 24 53 Subtract one hour from current date   2008 12 28 09 24 53 Subtract one minute from current date   2008 12 28 10 23 53 Subtract one second from current date   2008 12 28 10 24 52   This link is good   See here  And see   See too  And   Here  And    Here  And   Here  If you need just time    DateFormat dateFormat   new SimpleDateFormat  HH mm ss

User · Answer

Get the time in milliseconds  minus your minutes in milliseconds and convert it to Date  Here you need to objectify one         int minutes   60      long currentDateTime   System currentTimeMillis        Date currentDate   new Date currentDateTime - minutes 60 1000       System out println currentDate

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java util Calendar  Calendar cal   Calendar getInstance       remove next line if you re always using the current time  cal setTime currentDate   cal add Calendar HOUR  -1   Date oneHourBack   cal getTime      java util Date  new Date System currentTimeMillis   - 3600   1000     org joda time LocalDateTime  new LocalDateTime   minusHours 1    Java 8  java time LocalDateTime  LocalDateTime now   minusHours 1    Java 8 java time Instant     always in UTC if not timezone set Instant now   minus 1  ChronoUnit HOURS       with timezone  Europe Berlin for example Instant now           atZone ZoneId of  Europe Berlin            minusHours 1

[java] Changing Java Date one hour back

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