Java Date cut off time information

Question

I have a Java Date object containing date and time information  I want to write a method that cuts off the time information  truncates the hours-minutes-seconds  so I only have the date left   Example input   2008-01-01 13 15 00   Expected output   2008-01-01 00 00 00   Do you have a tip  I tried doing something like this    timestamp    24   60   60   1000      24   60   60   1000    but I ran into problems with the timezone

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You can do this to avoid timezone issue   public static Date truncDate Date date        Calendar cal   Calendar getInstance TimeZone getTimeZone  UTC         cal setTime date       cal set Calendar HOUR OF DAY  0       cal set Calendar MINUTE  0       cal set Calendar SECOND  0       cal set Calendar MILLISECOND  0       return cal getTime        Although Java Date object is timestamp value  but during truncate  it will be converted to local timezone  so you will get surprising value if you expect value from UTC timezone

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With Joda-Time since version 2 0 you can use LocalDate toDate     Simply      someDatetime is whatever java util Date you have  Date someDay   new LocalDate someDatetime  toDate

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Use DateUtils from Apache  with truncate  like this   DateUtils truncate Calendar getInstance   getTime    Calendar DATE

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For timestamps   timestamp -  timestamp    24   60   60   1000

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I did the truncation with new java8 API  I faced up with one strange thing but in general it s truncate     Instant instant   date toInstant    instant   instant truncatedTo ChronoUnit DAYS   date   Date from instant

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The question is contradictory  It asks for a date without a time of day yet displays an example with a time of 00 00 00   Joda-Time  UPDATE  The Joda-Time project is now in maintenance mode  with the team advising migration to the java time classes  See my other Answer for java time solution   If instead you want the time-of-day set to the first moment of the day  use a DateTime object on the Joda-Time library and call its withTimeAtStartOfDay method  Be aware that the first moment may not be the time 00 00 00 because of Daylight Saving Time or perhaps other anomalies

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Might be a late response but here is a way to do it in one line without using any libraries   new SimpleDateFormat  yyyy-MM-dd   parse new SimpleDateFormat  yyyy-MM-dd   format YOUR TIMESTAMP

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Use the Calendar class s set   method to set the HOUR OF DAY  MINUTE  SECOND and MILLISECOND fields to zero

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It really annoyed me that the new  improved  calendar constructor doesn t take an int for milliseconds like the  awful  old Date one  I then got really cross and wrote this   long stuffYou   startTime getTimeInMillis     1000  startTime setTimeInMillis startTime getTimeInMillis   - stuffYou     I didn t use the word  stuff  at the time  but then I discovered the happiness of this   startTime set Calendar MILLISECOND  0     But I m still quite cross about it

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From java util Date JavaDocs      The class Date represents a specific instant in time  with millisecond precision   and from the java sql Date JavaDocs      To conform with the definition of SQL DATE  the millisecond values wrapped by a java sql Date instance must be  normalized  by setting the hours  minutes  seconds  and milliseconds to zero in the particular time zone with which the instance is associated    So  the best approach is to use java sql Date if you are not in need of the time part  java util Date utilDate   new java util Date    java sql Date sqlDate   new java sql Date System currentTimeMillis       and the output is   java util Date   Thu Apr 26 16 22 53 PST 2012 java sql Date    2012-04-26

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Have you looked at the DateUtils truncate method in Apache Commons Lang   Date truncatedDate   DateUtils truncate new Date    Calendar DATE     will remove the time element

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I fixed the issue like this in Eastern eight zone Beijing time     private Date getTruncatedDate Date d        if  d    null            return null            long h   60   60   1000L      long dateStamp   d getTime   -  d getTime     8   h     24   h       return new Date dateStamp         First of all  you should be clear what is time stamp  Time stamp is the total milliseconds from Jan 01 00 00 00 1970 of GMT same as UTC   or Thu Jan 01 08 00 00 CST 1970 to now    Remember  Time stamp is independent of time zone   So you get same result with the following statement in differnt time zones   System out println new Date   getTime       And   System out println new Date 0      prints diferent time info in different time zones  If you set your pc time zone as UTC  you get   Thu Jan 01 00 00 00 UTC 1970   But if you set the time zone as  UTC  8 00  Beijing  Chongqing  HongKong  Urumq  you get   Thu Jan 01 08 00 00 CST 1970   Java gets the time stamp  then displays date and time info according on the time zone   For the introduction of how Java displays date and time info in different time zones  how to trancate the time info is easy  You should get the  time stamp   and take the time zone into account when cut off the time info  Then you can create a new Date object with the cut time stamp we can call it date stamp   java will compensate the time zone when displays date info   As in  Eastern eight zone Beijing time   the Beijing time is earlier 8 hours than   GMT  so you should subtract more 8 hours when you do the modulo operation   That s to say  you should get the GMT time first  then Java will add 8 hours when display time based on your pc s time zone setting     The time zone issue  is obscure  and also puzzles me for a long time  Now I make it clear  Hope helps     2018-01-04 The method below also works   private Date getTruncatedDate2 Date d        Calendar cal   Calendar getInstance       locale-specific     cal setTime d       cal set Calendar HOUR OF DAY  0       cal set Calendar MINUTE  0       cal set Calendar SECOND  0       cal set Calendar MILLISECOND  0     return cal getTime

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The recommended way to do date time manipulation is to use a Calendar object   Calendar cal   Calendar getInstance       locale-specific cal setTime dateObject   cal set Calendar HOUR OF DAY  0   cal set Calendar MINUTE  0   cal set Calendar SECOND  0   cal set Calendar MILLISECOND  0   long time   cal getTimeInMillis

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Just clear   redundant fields   Calendar calendar   Calendar getInstance    calendar setTime date   calendar set Calendar HOUR OF DAY  0   calendar clear Calendar MINUTE   calendar clear Calendar SECOND   calendar clear Calendar MILLISECOND   Date truncatedDate   calendar getTime      From Java 8 a better option is to use truncatedTo method of LocalDateTime  e g    LocalDateTime now   truncatedTo ChronoUnit DAYS

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For all the answers using Calendar  you should use it like this instead  public static Date truncateDate Date date        Calendar c   Calendar getInstance        c setTime date       c set Calendar HOUR OF DAY  c getActualMinimum Calendar HOUR OF DAY        c set Calendar MINUTE  c getActualMinimum Calendar MINUTE        c set Calendar SECOND  c getActualMinimum Calendar SECOND        c set Calendar MILLISECOND  c getActualMinimum Calendar MILLISECOND        return c getTime        But I prefer this   public static Date truncateDate Date date        return new java sql Date date getTime

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Have you looked at Joda   It s a much easier and more intuitive way to work with dates and times  For instance you can convert trivially between  say  LocalDateTime and LocalDate objects   e g   to illustrate the API   LocalDate date   new LocalDateTime milliseconds  toLocalDate     Additionally it solves some thread-safety issues with date time formatters and is to be strongly recommended for working with any date time issues in Java

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With Joda you can easily get the expected date   As of version 2 7  maybe since some previous version greater than 2 2   as a commenter notes  toDateMidnight has been deprecated in favor or the aptly named withTimeAtStartOfDay    making the convenient  DateTime now   withTimeAtStartOfDay     possible   Benefit added of a way nicer API   With older versions  you can do  new DateTime new Date    toDateMidnight   toDate

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Date date   new Date    Calendar cal   Calendar getInstance    cal setTime date   cal set Calendar HOUR OF DAY  0   cal set Calendar MINUTE  0   cal set Calendar SECOND  0   cal set Calendar MILLISECOND  0   date   cal getTime

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Just a quick update in light of the java time classes now built into Java 8 and later   LocalDateTime has a truncatedTo method that effectively addresses what you are talking about here   LocalDateTime now   truncatedTo ChronoUnit MINUTES    This will express the current time down to minutes only   2015-03-05T11 47   You may use a ChronoUnit  or a TemporalUnit  smaller than DAYS to execute the truncation  as the truncation is applied only to the time part of LocalDateTime  not to the date part

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tl dr  LocalDateTime parse                                Lacking an offset or time zone  parse as a  LocalDateTime    Not  a specific moment in time       2008-01-01 13 15 00  replace         T        Alter input string to comply with ISO 8601 standard format     toLocalDate                                       Extract a date-only value   atStartOfDay                                      Do not assume the day starts at 00 00 00  Let class determine start-of-day      ZoneId of   Europe Paris                       Determining a specific start-of-day requires a time zone                                                     Result is a  ZonedDateTime  object  At this point we have a specific moment in time  a point on the timeline   toString                                          Generate a String in standard ISO 8601 format  wisely extended to append the name of the time zone in square brackets       2008-01-01T00 00 01 00 Europe Paris    To generate a String in your desired format  pass a DateTimeFormatter    LocalDateTime parse                                Lacking an offset or time zone  parse as a  LocalDateTime    Not  a specific moment in time       2008-01-01 13 15 00  replace         T        Alter input string to comply with ISO 8601 standard format     toLocalDate                                       Extract a date-only value   atStartOfDay                                      Do not assume the day starts at 00 00 00  Let class determine start-of-day      ZoneId of   Europe Paris                       Determining a specific start-of-day requires a time zone                                                     Result is a  ZonedDateTime  object  At this point we have a specific moment in time  a point on the timeline   format                                            Generate a String representing the object   s value      DateTimeFormatter ISO LOCAL DATE TIME          Built-in predefined formatter close to what you want      replace   T                                       Replace the standard   s use of a  T  in the middle with your desired SPACE character       2008-01-01 00 00 00   Details  Other Answers are correct  but use old date-time classes now outmoded by the java time framework   java time  The java time framework is built into Java 8 and later  Much of the java time functionality is back-ported to Java 6  amp  7  ThreeTen-Backport  and further adapted to Android  ThreeTenABP    First alter the input string to comply with the canonical version of ISO 8601 format  The standard ISO 8601 formats are used by default in java time classes for parsing generating strings that represent date-time values  We need to replace that SPACE in the middle with a T   String input    2008-01-01 13 15 00  replace         T           2008-01-01T13 15 00   Now we can parse it as a LocalDateTime  where    Local    means no specific locality  The input lacks any offset-from-UTC or time zone info   LocalDateTime ldt   LocalDateTime parse  input         ldt toString      2008-01-01T13 15 00   If you do not care about time-of-day nor time zone  then convert to a LocalDate   LocalDate ld   ldt toLocalDate         ld toString      2008-01-01   First Moment Of Day  If instead you want the time-of-day set to the first moment of the day  use a ZonedDateTime class  then convert to a LocalDate object to call its atStartOfDay method  Be aware that the first moment may not be the time 00 00 00 because of Daylight Saving Time or perhaps other anomalies   The time zone is crucial because for any given moment the date varies around the world by zone  For example  a few moments after midnight in Paris is a new day for Parisians but is still    yesterday    in Montr  al for the Canadians   ZoneId zoneId   ZoneId of   America Montreal     ZonedDateTime zdt   ldt atZone  zoneId    LocalDate ldFromZdt   zdt toLocalDate    ZonedDateTime zdtStartOfDay   ldFromZdt atStartOfDay  zoneId         zdtStartOfDay toString      2008-01-01T00 00 00-05 00 America Montreal    UTC  To see that moment through the lens of the UTC time zone  extract a Instant object  Both the ZonedDateTime and Instant will represent the same moment on the timeline but appear as two different wall-clock times   An Instant is the basic building-block class in java time  always in UTC by definition  Use this class frequently  as you should generally be doing your business logic  data storage  and data exchange in UTC   Instant instant   zdtStartOfDay toInstant         instant toString      2008-01-01T05 00 00Z   We see 5 AM rather than stroke-of-midnight  In standard format  the Z on the end is short for Zulu and means    UTC        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  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        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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Here s a simple way to get date without time if you are using Java 8   Use java time LocalDate type instead of Date   LocalDate now   LocalDate now     System out println now toString       The output   2019-05-30   https   docs oracle com javase 8 docs api java time LocalDate html

[java] Java Date cut off time information

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