How to set time to a date object in java

Question

I created a Date object in Java  When I do so  it shows something like  date Tue Aug 09 00 00 00 IST 2011  As a result  it appears that my Excel file is lesser by one day  27 feb becomes 26 feb and so on  I think it must be because of time  How can I set it to something like 5 30 pm

User · Accepted Answer

Calendar cal   Calendar getInstance    cal set Calendar HOUR OF DAY 17   cal set Calendar MINUTE 30   cal set Calendar SECOND 0   cal set Calendar MILLISECOND 0    Date d   cal getTime      Also See   Joda time Calendar doc

User · Answer

Can you show code which you use for setting date object  Anyway lt  you can use this code for intialisation of date   new SimpleDateFormat  yyyy-MM-dd hh mm ss   parse  2011-01-01 00 00 00

User · Answer

If you don t have access to java 8 and the API java time  here is my simple function to copy the time of one date to another date using the old java util Calendar  inspire by Jigar Joshi            Copy only the time of one date to the date of another date      public static Date copyTimeToDate Date date  Date time        Calendar t   Calendar getInstance        t setTime time        Calendar c   Calendar getInstance        c setTime date       c set Calendar HOUR OF DAY  t get Calendar HOUR OF DAY        c set Calendar MINUTE  t get Calendar MINUTE        c set Calendar SECOND  t get Calendar SECOND        c set Calendar MILLISECOND  t get Calendar MILLISECOND        return c getTime

User · Answer

I should like to contribute the modern answer  This involves using java time  the modern Java date and time API  and not the old Date nor Calendar except where there   s no way to avoid it   Your issue is very likely really a timezone issue  When it is Tue Aug 09 00 00 00 IST 2011  in time zones west of IST midnight has not yet been reached  It is still Aug 8  If for example your API for putting the date into Excel expects UTC  the date will be the day before the one you intended  I believe the real and good solution is to produce a date-time of 00 00 UTC  or whatever time zone or offset is expected and used at the other end        LocalDate yourDate   LocalDate of 2018  Month FEBRUARY  27       ZonedDateTime utcDateDime   yourDate atStartOfDay ZoneOffset UTC       System out println utcDateDime     This prints  2018-02-27T00 00Z   Z means UTC  think of it as offset zero from UTC or Zulu time zone   Better still  of course  if you could pass the LocalDate from the first code line to Excel  It doesn   t include time-of-day  so there is no confusion possible  On the other hand  if you need an old-fashioned Date object for that  convert just before handing the Date on       Date oldfashionedDate   Date from utcDateDime toInstant         System out println oldfashionedDate     On my computer this prints  Tue Feb 27 01 00 00 CET 2018   Don   t be fooled  it is correct  My time zone  Central European Time  is at offset  01 00 from UTC in February  standard time   so 01 00 00 here is equal to 00 00 00 UTC  It   s just Date toString   grabbing the JVMs time zone and using it for producing the string      How can I set it to something like 5 30 pm    To answer your direct question directly  if you have a ZonedDateTime  OffsetDateTime or LocalDateTime  in all of these cases the following will accomplish what you asked for       yourDateTime   yourDateTime with LocalTime of 17  30      If yourDateTime was a LocalDateTime of 2018-02-27T00 00  it will now be 2018-02-27T17 30  Similarly for the other types  only they include offset and time zone too as appropriate   If you only had a date  as in the first snippet above  you can also add time-of-day information to it       LocalDate yourDate   LocalDate of 2018  Month FEBRUARY  27       LocalDateTime dateTime   yourDate atTime LocalTime of 17  30      For most purposes you should prefer to add the time-of-day in a specific time zone  though  for example      ZonedDateTime dateTime   yourDate atTime LocalTime of 17  30                atZone ZoneId of  Asia Kolkata       This yields 2018-02-27T17 30 05 30 Asia Kolkata    Date and Calendar vs java time  The Date class that you use as well as Calendar and SimpleDateFormat used in the other answers are long outdated  and SimpleDateFormat in particular has proven troublesome  In all cases the modern Java date and time API is so much nicer to work with  Which is why I wanted to provide this answer to an old question that is still being visited   Link  Oracle Tutorial Date Time  explaining how to use java time

[java] How to set time to a date object in java

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