How to set 24-hours format for date on java

Question

I have been developing Android application where I use this code   Date d new Date new Date   getTime   28800000   String s new SimpleDateFormat  dd MM yyyy hh mm ss   format d     I need to get date after 8 hours from current moment  and I want that this date has 24-hours format  but I don t know how I can make it by SimpleDateFormat  I also need that date has DD MM YYYY HH MM SS format

User · Answer

Try below code      String dateStr    Jul 27  2011 8 35 29 PM       DateFormat readFormat   new SimpleDateFormat   MMM dd  yyyy hh mm ss aa        DateFormat writeFormat   new SimpleDateFormat   yyyy-MM-dd HH mm ss        Date date   null      try          date   readFormat parse  dateStr          catch   ParseException e             e printStackTrace               String formattedDate           if  date    null         formattedDate   writeFormat format  date               System out println formattedDate     Good Luck     Check for various formats

User · Answer

You can do it like this   Date d new Date new Date   getTime   28800000   String s new SimpleDateFormat  dd MM yyyy kk mm ss   format d     here  kk mm ss  is right answer  I confused with Oracle database  sorry

User · Answer

This will give you the date in 24 hour format        Date date   new Date        date setHours date getHours     8       System out println date       SimpleDateFormat simpDate      simpDate   new SimpleDateFormat  kk mm ss        System out println simpDate format date

User · Answer

Try this     Calendar calendar   Calendar getInstance    String currentDate24Hrs    String  DateFormat format               MM dd yyyy kk mm ss   calendar getTime     Log i  DEBUG TAG    24Hrs format date      currentDate24Hrs

User · Answer

for 12-hours format    SimpleDateFormat simpleDateFormatArrivals   new SimpleDateFormat  hh mm   Locale UK     for 24-hours format   SimpleDateFormat simpleDateFormatArrivals   new SimpleDateFormat  HH mm   Locale UK

User · Answer

Date d new Date new Date   getTime   28800000   String s new SimpleDateFormat  dd MM yyyy HH mm ss   format d     HH will return 0-23 for hours   kk will return 1-24 for hours   See more here  Customizing Formats  use method setIs24HourView Boolean is24HourView  to set time picker to set 24 hour view

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LocalDateTime plusHours LocalDateTime is modelled on ISO-8601 standards and was introduced with Java-8 as part of JSR-310 implementation  Use LocalDateTime plusHours to get a copy of this LocalDateTime with the specified number of hours added  import java time LocalDateTime  import java time ZoneId  import java time format DateTimeFormatter  import java util Locale   public class Main       public static void main String   args               ZoneId systemDefault   returns the timezone of your JVM  It is also the            default timezone for date-time type i e             LocalDateTime now ZoneId systemDefault    is same as LocalDateTime now               Change the timezone as per your requirement e g  ZoneId of  quot Europe London quot           LocalDateTime ldt   LocalDateTime now ZoneId systemDefault             System out println ldt            LocalDateTime after8Hours   ldt plusHours 8           System out println after8Hours               Custom format         DateTimeFormatter dtfTimeFormat24H   DateTimeFormatter ofPattern  quot dd MM uuuu HH mm ss quot   Locale ENGLISH           DateTimeFormatter dtfTimeFormat12h   DateTimeFormatter ofPattern  quot dd MM uuuu hh mm ss a quot   Locale ENGLISH           System out println dtfTimeFormat24H format after8Hours            System out println dtfTimeFormat12h format after8Hours             Output  2021-01-07T15 24 52 736612 2021-01-07T23 24 52 736612 07 01 2021 23 24 52 07 01 2021 11 24 52 PM  Learn more about the modern date-time API from Trail  Date Time  Using legacy API  import java text SimpleDateFormat  import java util Calendar  import java util Date  import java util Locale  import java util TimeZone   public class Main       public static void main String   args            Calendar calendar   Calendar getInstance            Date currentDateTime   calendar getTime            System out println currentDateTime               After 8 hours         calendar add Calendar HOUR OF DAY  8           Date after8Hours   calendar getTime            System out println after8Hours               Custom formats         SimpleDateFormat sdf24H   new SimpleDateFormat  quot dd MM yyyy HH mm ss quot   Locale ENGLISH              Change the timezone as per your requirement e g             TimeZone getTimeZone  quot Europe London quot           sdf24H setTimeZone TimeZone getDefault              SimpleDateFormat sdf12h   new SimpleDateFormat  quot dd MM yyyy hh mm ss a quot   Locale ENGLISH           sdf12h setTimeZone TimeZone getDefault              System out println sdf24H format after8Hours            System out println sdf12h format after8Hours             Output  Thu Jan 07 15 34 10 GMT 2021 Thu Jan 07 23 34 10 GMT 2021 07 01 2021 23 34 10 07 01 2021 11 34 10 PM  Some important notes   A date-time object is supposed to store the information about date  time  timezone etc   not about the formatting  You can format a date-time object into a String with the pattern of your choice using date-time formatting API   The date-time formatting API for the modern date-time types is in the package  java time format e g  java time format DateTimeFormatter  java time format DateTimeFormatterBuilder etc  The date-time formatting API for the legacy date-time types is in the package  java text e g  java text SimpleDateFormat  java text DateFormat etc    The java util Date object is not a real date-time object like the modern date-time types  rather  it represents the milliseconds from the Epoch of January 1  1970  When you print an object of java util Date  its toString method returns the date-time in the JVM s timezone  calculated from this milliseconds value  If you need to print the date-time in a different timezone  you will need to set the timezone to SimpleDateFormat and obtain the formatted string from it  The date-time API of java util and their formatting API  SimpleDateFormat are outdated and error-prone  It is recommended to stop using them completely and switch to the modern date-time API   For any reason  if you have to stick to Java 6 or Java 7  you can use ThreeTen-Backport which backports most of the java time functionality to Java 6  amp  7  If you are working for an Android project and your Android API level is still not compliant with Java-8  check Java 8  APIs available through desugaring and How to use ThreeTenABP in Android Project

User · Answer

tl dr  The modern approach uses java time classes   Instant now                                             Capture current moment in UTC          truncatedTo  ChronoUnit SECONDS                 Lop off any fractional second          plus  8   ChronoUnit HOURS                      Add eight hours          atZone  ZoneId of   America Montreal            Adjust from UTC to the wall-clock time used by the people of a certain region  a time zone   Returns a  ZonedDateTime  object          format                                          Generate a  String  object representing textually the value of the  ZonedDateTime  object             DateTimeFormatter ofPattern   dd MM uuuu HH mm ss                                 withLocale  Locale US      Specify a  Locale  to determine the human language and cultural norms used in localizing the text being generated                                                           Returns a  String  object       23 01 2017 15 34 56   java time  FYI  the old Calendar and Date classes are now legacy  Supplanted by the java time classes  Much of java time is back-ported to Java 6  Java 7  and Android  see below    Instant  Capture the current moment in UTC with the Instant class    Instant instantNow   Instant now         instant toString    2017-01-23T12 34 56 789Z   If you want only whole seconds  without any fraction of a second  truncate   Instant instant   instantNow truncatedTo  ChronoUnit SECONDS         instant toString    2017-01-23T12 34 56Z   Math  The Instant class can do math  adding an amount of time  Specify the amount of time to add by the ChronoUnit enum  an implementation of TemporalUnit   instant   instant plus  8   ChronoUnit HOURS         instant toString    2017-01-23T20 34 56Z   ZonedDateTime  To see that same moment through the lens of a particular region   s wall-clock time  apply a ZoneId to get a ZonedDateTime    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 as they are not true time zones  not standardized  and not even unique       ZoneId z   ZoneId of   America Montreal     ZonedDateTime zdt   instant atZone  z         zdt toString    2017-01-23T15 34 56-05 00 America Montreal    Generate string  You can generate a String in your desired format by specifying a formatting pattern in a DateTimeFormatter object   Note that case matters in the letters of your formatting pattern  The Question   s code had hh which is for 12-hour time while uppercase HH is 24-hour time  0-23  in both java time DateTimeFormatter as well as the legacy java text SimpleDateFormat    The formatting codes in java time are similar to those in the legacy SimpleDateFormat but not exactly the same  Carefully study the class doc  Here  HH happens to work identically   DateTimeFormatter f   DateTimeFormatter ofPattern   dd MM uuuu HH mm ss    withLocale  Locale US    String output   zdt format  f      Automatic localization  Rather than hard-coding a formatting pattern  consider letting java time fully localize the generation of the String text by calling DateTimeFormatter ofLocalizedDateTime   And  by the way  be aware that time zone and Locale have nothing to do with one another  orthogonal issues  One is about content  the meaning  the wall-clock time   The other is about presentation  determining the human language and cultural norms used in presenting that meaning to the user   Instant instant   Instant parse   2017-01-23T12 34 56Z     ZoneId z   ZoneId of   Pacific Auckland         Notice that time zone is unrelated to the  Locale  used in localizing  ZonedDateTime zdt   instant atZone  z     DateTimeFormatter f   DateTimeFormatter ofLocalizedDateTime  FormatStyle FULL                                           withLocale  Locale CANADA FRENCH        The locale determines human language and cultural norms used in generating the text representing this date-time object  String output   zdt format  f         instant toString    2017-01-23T12 34 56Z      zdt toString    2017-01-24T01 34 56 13 00 Pacific Auckland        output  mardi 24 janvier 2017    01 34 56 heure avanc  e de la Nouvelle-Z  lande     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  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          Joda-Time  Update  The Joda-Time project is now in maintenance mode  with the team advising migration to the java time classes   Joda-Time makes this kind of work much easier         2013 Basil Bourque  This source code may be used freely forever by anyone taking full responsibility for doing so     import org joda time       import org joda time format     DateTime later   DateTime now   plusHours  8    DateTimeFormatter formatter   DateTimeFormat forPattern   dd MM yyyy HH mm ss     String laterAsText   formatter print  later     System out println   laterAsText      laterAsText      When run     laterAsText  19 12 2013 02 50 18   Beware that this syntax uses default time zone  A better practice is to use an explicit DateTimeZone instance

User · Answer

All u need do is to change the lowercase  hh  in the pattern to an uppercase letter  HH  for Kotlin  val sdf   SimpleDateFormat  quot yyyy-MM-dd HH mm ss quot   val currentDate   sdf format Date    for java  SimpleDateFormat sdf   new SimpleDateFormat  quot yyyy-MM-ddHH mm ss quot   Date currentDate   sdf format new Date

User · Answer

Use HH instead of hh in formatter string

[java] How to set 24-hours format for date on java?

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