How to set time to 24 hour format in Calendar

Question

I need to set the time on the current date  The time string is always in 24 hour format but the result I get is wrong     SimpleDateFormat df   new SimpleDateFormat  kk mm      Date d1   df parse  10 30      Calendar c1   Calendar getInstance      c1 set Calendar HOUR  d1 getHours       c1 set Calendar MINUTE  d1 getMinutes       The date should be today s date and the time set to 10 30  Instead the time in c1 ends up being 22 30  How can I force the calendar control to recognize my time is 24 hour format   EDIT  If I just do this   Calendar c1   Calendar getInstance    c1 set Calendar HOUR  10   c1 set Calendar MINUTE  30     This gives me the same result  Why

User · Answer

Here you will get all kinds of time related problems  I hope this will solve your problem   public class MyClass        public static void main String   args              Calendar cal   Calendar getInstance                To get the current hour         int hour   cal get Calendar HOUR OF DAY           System out println  hour      hour               To get the current time in 12 hours format         SimpleDateFormat sdf   new SimpleDateFormat  hh mm a  Locale US           String a   sdf format cal getTime             System out println  Time      a               To get the desired time in 12 hours format from 23 hours format         cal set Calendar HOUR OF DAY  24           SimpleDateFormat sdf1   new SimpleDateFormat  hh mm a  Locale ENGLISH           String a1   sdf1 format cal getTime             System out println  Time      a1                H Hour in day  0-23               k Hour in day  1-24                         To get the desired time in 24 hours format as 0-23 or 1-24         cal set Calendar HOUR OF DAY  24           SimpleDateFormat sdf2   new SimpleDateFormat  HH mm  Locale ENGLISH           SimpleDateFormat sdf3   new SimpleDateFormat  kk mm  Locale ENGLISH           String a2   sdf2 format cal getTime             String a3   sdf3 format cal getTime             System out println  Time      a2           System out println  Time      a3              For example  time like 12 30 PM  How can i convert to 24 hours time in java           SimpleDateFormat bigFormat   new SimpleDateFormat  kk mm            SimpleDateFormat smallFormat   new SimpleDateFormat  hh mm a             Date date   null          try               date   smallFormat parse  12 30 AM              catch  ParseException e                e printStackTrace                              System out println smallFormat format date            bigFormat format date

User · Answer

I am using fullcalendar on my project recently  I don t know what exact view effect you want to achieve  in my project I want to change the event time view from 12h format from    to 24h format     If this is the effect you want to achieve  the solution below might help   set         timeFormat   H mm

User · Answer

tl dr  LocalTime parse   10 30        Parsed as 24-hour time    java time  Avoid the troublesome old date-time classes such as Date and Calendar that are now supplanted by the java time classes    LocalTime  The java time classes provide a way to represent the time-of-day without a date and without a time zone  LocalTime  LocalTime lt   LocalTime of  10   30        10 30 AM  LocalTime lt   LocalTime of  22   30        22 30 is 10 30 PM    ISO 8601  The java time classes use standard ISO 8601 formats by default when generating and parsing strings  These formats use 24-hour time   String output   lt toString         LocalTime of  10   30   toString     10 30      LocalTime of  22   30   toString     22 30   So parsing 10 30 will be interpreted as 10 30 AM   LocalTime lt   LocalTime parse   10 30         10 30 AM    DateTimeFormatter  If you need to generate or parse strings in 12-hour click format with AM PM  use the DateTimeFormatter class  Tip  make a habit of specifying a Locale

User · Answer

private void setClock          Timeline clock   new Timeline new KeyFrame Duration ZERO  e - gt            Calendar cal   Calendar getInstance            int second   cal get Calendar SECOND           int minute   cal get Calendar MINUTE           int  hour   cal get Calendar HOUR OF DAY           eski minut   minute          if second  lt  10                time label setText hour          minute      0    second             else if  minute  lt  10               time label setText hour     0     minute      0    second                      else           time label setText hour          minute          second                        new KeyFrame Duration seconds 1              clock setCycleCount Animation INDEFINITE       clock play

User · Answer

You can set the calendar to use only AM or PM using     calendar set Calendar AM PM  int     0   AM  1   PM  Hope this helps

User · Answer

Try this    SimpleDateFormat df   new SimpleDateFormat  hh mm      Or  SimpleDateFormat df   new SimpleDateFormat  KK mm      Reference   SimpleDateFormat

User · Answer

if you replace in the function SimpleDateFormat  hh   with   HH   will format the hour in 24 hours instead of 12   SimpleDateFormat df   new SimpleDateFormat  HH mm

User · Answer

use  SimpleDateFormat df   new SimpleDateFormat  HH mm    instead  UPDATE   Ingo is right  is s better use setTime d1    first method getHours   and getMinutes   is now deprecated  I test this code   SimpleDateFormat df   new SimpleDateFormat  hh mm      Date d1   df parse  23 30      Calendar c1   GregorianCalendar getInstance      c1 setTime d1     System out println c1 getTime       and output is ok Thu Jan 01 23 30 00 FET 1970  try this   SimpleDateFormat df   new SimpleDateFormat  KK mm aa      Date d1   df parse  10 30 PM      Calendar c1   GregorianCalendar getInstance Locale US     SimpleDateFormat sdf   new SimpleDateFormat  HH mm ss        c1 setTime d1     String str   sdf format c1 getTime       System out println str

User · Answer

Replace this   c1 set Calendar HOUR  d1 getHours       with this   c1 set Calendar HOUR OF DAY  d1 getHours       Calendar HOUR is strictly for 12 hours

[java] How to set time to 24 hour format in Calendar

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