how to create a Java Date object of midnight today and midnight tomorrow

Question

In my code I need to find all my things that happened today   So I need to compare against dates from today at 00 00am  midnight early this morning  to 12 00pm  midnight tonight    I know      Date today   new Date           gets me right now   And      Date beginning   new Date 0         gets me zero time on Jan 1  1970   But what s an easy way to get zero time today and zero time tomorrow   UPDATE  I did this  but surely there s an easier way   Calendar calStart   new GregorianCalendar    calStart setTime new Date     calStart set Calendar HOUR OF DAY  0   calStart set Calendar MINUTE  0   calStart set Calendar SECOND  0   calStart set Calendar MILLISECOND  0   Date midnightYesterday   calStart getTime     Calendar calEnd   new GregorianCalendar    calEnd setTime new Date     calEnd set Calendar DAY OF YEAR  calEnd get Calendar DAY OF YEAR  1   calEnd set Calendar HOUR OF DAY  0   calEnd set Calendar MINUTE  0   calEnd set Calendar SECOND  0   calEnd set Calendar MILLISECOND  0   Date midnightTonight   calEnd getTime

User · Answer

I did this differently than everyone else here did. I'm new to Java, so maybe my solution is poor.

Date now = new Date();
Date midnightToday = new Date(now.getYear(), now.getMonth(), now.getDate());

I'm not sure this works yet, but either way, I'd appreciate any feedback on this solution.

I'm confused by the statement above that you can calculate tomorrow by calling:

c.add(Calendar.DAY_OF_MONTH, 1);

If you add 1 to the day of the month and it's the 31st day, don't you get the 32nd day of the month?

Why are times/dates not all based on UTC in Java? I would think Timezones should only be needed when used with i/o, but internally should always be used in UTC. However, the classes seem to include Timezone info which seems not only wasteful, but prone to coding errors.

User · Answer

these methods will help you-  public static Date getStartOfDay Date date         Calendar calendar   Calendar getInstance         calendar setTime date        calendar set Calendar HOUR OF DAY  0        calendar set Calendar MINUTE  0        calendar set Calendar SECOND  0        calendar set Calendar MILLISECOND  0        return calendar getTime         and   public static Date getEndOfDay Date date        Calendar calendar   Calendar getInstance        calendar setTime date       calendar set Calendar HOUR OF DAY  23       calendar set Calendar MINUTE  59       calendar set Calendar SECOND  59       calendar set Calendar MILLISECOND  999       return calendar getTime

User · Answer

The easiest way to find a midnight   Long time   new Date   getTime    Date date   new Date time - time    24   60   60   1000      Next day   Date date   new Date date getTime     24   60   60   1000

User · Answer

Date todayMidnightUTC   java sql Date valueOf LocalDate now     Date tomorrowMidnightUTC   java sql Date valueOf LocalDate now   plusDays 1    Date anyMidnightLocal   java sql Date valueOf LocalDate from dateTime toInstant   atZone ZoneId systemDefault         But beware that java sql Date toInstant   always throws UnsupportedOperationException   Via LocalDate to java util Date and vice versa simpliest conversion

User · Answer

Because of one day is 24   60   60   1000 ms   the midnight of this day can be calculate as     long now   System currentTimeMillis    long delta   now   24   60   60   1000  long midnight   now - delta  Date midnightDate   new Date midnight

User · Answer

As of JodaTime 2 3  the toDateMidnight   is deprecated   From Upgrade from 2 2 to 2 3       Deprecations since 2 2     ----------------------     - DateMidnight   41       This class is flawed in concept      The time of midnight occasionally does not occur in some time-zones      This is a result of a daylight savings time from 00 00 to 01 00      DateMidnight is essentially a DateTime with a time locked to midnight      Such a concept is more generally a poor one to use  given LocalDate      Replace DateMidnight with LocalDate      Or replace it with DateTime  perhaps using the withTimeAtStartOfDay   method   Here is a sample code without toDateMidnight   method   Code  DateTime todayAtMidnight   new DateTime   withTimeAtStartOfDay    System out println todayAtMidnight toString  yyyy-MM-dd HH mm ss       Output  may be different depending on your local time zone   2013-09-28 00 00 00

User · Answer

This appears to be an option   DateFormat justDay   new SimpleDateFormat  yyyyMMdd    Date thisMorningMidnight   justDay parse justDay format new Date        to add a day to it  either  Date tomorrow   new Date thisMorningMidnight getTime     24   60   60   1000     or  Calendar c   Calendar getInstance    c setTime thisMorningMidnight   c add Calendar DATE  1   Date tomorrowFromCalendar   c getTime      I have a hunch the latter is preferred in case of something weird like daylight savings causing adding 24 hours to not be enough  see https   stackoverflow com a 4336131 32453 and its other answers

User · Answer

Other answers are correct  especially the java time answer by arganzheng  As some mentioned  you should avoid the old java util Date  Calendar classes as they are poorly designed  confusing  and troublesome  They have been supplanted by the java time classes   Let me add notes about strategy around handling midnight and spans of time   Half-Open  In date-time work  spans of time are often defined using the    Half-Open    approach  In this approach the beginning is inclusive while the ending is exclusive  This solves problems and if used consistently makes reasoning about your date-time handling much easier    One problem solved is defining the end of the day  Is the last moment of the day 23 59 59 999  milliseconds   Perhaps  in the java util Date class  from earliest Java  troublesome     avoid this class   and in the highly successful Joda-Time library  But in other software  such as database like Postgres  the last moment will be 23 59 59 999999  microseconds   But in other software such as the java time framework  built into Java 8 and later  successor to Joda-Time  and in some database such the H2 Database  the last moment might be 23 59 59 999999999  nanoseconds   Rather than splitting hairs  think in terms of first moment only  not last moment   In Half-Open  a day runs from the first moment of one day and goes up to but does not include the first moment of the following day  So rather than think like this         from today at 00 00am  midnight early this morning  to 12 00pm  midnight tonight        think like this        from first moment of today running up to but not including first moment of tomorrow      00 00 00 0 today AND  lt  00 00 00 0 tomorrow     In database work  this approach means not using the BETWEEN operator in SQL   Start of day  Furthermore  the first moment of the day is not always the time-of-day 00 00 00 0  Daylight Saving Time  DST  in some time zones  and possibly other anomalies  can mean a different time starts the day    So let the java time classes do the work of determining the start of a day with a call to LocalDate  atStartOfDay  ZoneId    So we have to detour through LocalDate and back to ZonedDateTime as you can see in this example code   ZoneId zoneId   ZoneId of   America Montreal     ZonedDateTime now   ZonedDateTime now  zoneId    ZonedDateTime todayStart   now toLocalDate   atStartOfDay  zoneId    ZonedDateTime tomorrowStart   todayStart plusDays  1      Note the passing of the optional ZoneId  If omitted your JVM   s current default time zone is applied implicitly  Better to be explicit   Time zone is crucial to date-time work  The Question and some other Answers are potentially flawed because the do not consciously handle time zone   Convert  If you must use a java util Date or  Calendar  look for new conversion methods added to those old classes   java util Date utilDate   java util Date from  todayStart toInstant      java util GregorianCalendar gregCal   java util GregorianCalendar from  todayStart      Span of time  By the way  if you are doing much work with spans of time take a look at    Duration Period IntervalThe Interval class is found in the ThreeTen-Extra project  an extension to the java time framework  This project is the proving ground for possible future additions to java time Interval todayMontreal   Interval of  todayStart toInstant     tomorrowStart 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

User · Answer

Remember  Date is not used to represent dates      To represent date you need a calendar  This   Calendar c   new GregorianCalendar      will create a Calendar instance representing present date in your current time zone  Now what you need is to truncate every field below day  hour  minute  second and millisecond  by setting it to 0  You now have a midnight today   Now to get midnight next day  you need to add one day   c add Calendar DAY OF MONTH  1     Note that adding 86400 seconds or 24 hours is incorrect due to summer time that might occur in the meantime   UPDATE  However my favourite way to deal with this problem is to use DateUtils class from Commons Lang   Date start   DateUtils truncate new Date    Calendar DAY OF MONTH   Date end   DateUtils addDays start  1     It uses Calendar behind the scenes

User · Answer

For sake of completeness  if you are using Java 8 you can also use the truncatedTo method of the Instant class to get midnight in UTC   Instant now   truncatedTo ChronoUnit DAYS     As written in the Javadoc     For example  truncating with the MINUTES unit will round down to the nearest minute  setting the seconds and nanoseconds to zero    Hope it helps

User · Answer

java util Calendar     today     Calendar date   new GregorianCalendar       reset hour  minutes  seconds and millis date set Calendar HOUR OF DAY  0   date set Calendar MINUTE  0   date set Calendar SECOND  0   date set Calendar MILLISECOND  0       next day date add Calendar DAY OF MONTH  1       JDK 8 - java time LocalTime and java time LocalDate  LocalTime midnight   LocalTime MIDNIGHT  LocalDate today   LocalDate now ZoneId of  Europe Berlin     LocalDateTime todayMidnight   LocalDateTime of today  midnight   LocalDateTime tomorrowMidnight   todayMidnight plusDays 1       Joda-Time  If you re using a JDK  lt  8  I recommend Joda Time  because the API is really nice    DateTime date   new DateTime   toDateMidnight   toDateTime    DateTime tomorrow   date plusDays 1       Since version 2 3 of Joda Time DateMidnight is deprecated  so use this   DateTime today   new DateTime   withTimeAtStartOfDay    DateTime tomorrow   today plusDays 1  withTimeAtStartOfDay      Pass a time zone if you don t want the JVM   s current default time zone   DateTimeZone timeZone   DateTimeZone forID  America Montreal    DateTime today   new DateTime timeZone  withTimeAtStartOfDay       Pass time zone to constructor

User · Answer

Apache Commons Lang  DateUtils isSameDay date1  date2    http   commons apache org proper commons-lang javadocs api-2 6 org apache commons lang time DateUtils html isSameDay java util Date  java util Date

User · Answer

JDK8 - Java Time Module way  LocalDateTime todayMidnight   LocalDate now   atStartOfDay    Also work  LocalDateTime todayMidnight   LocalDateTime now   with LocalTime MIDNIGHT

User · Answer

The simplest way with JodaTime    DateMidnight date   DateMidnight now

User · Answer

Date now  new Date       Today midnight Date todayMidnight   new Date endTime getTime   -endTime getTime   DateUtils MILLIS PER DAY       tomorrow midnight Date tomorrowMidnight   new Date endTime getTime   -endTime getTime   DateUtils MILLIS PER DAY   DateUtils MILLIS PER DAY

User · Answer

Pretty much as the answers before  but nobody mentioned AM PM parameter       Calendar cal   Calendar getInstance        cal set Calendar HOUR  0       cal set Calendar MINUTE  0       cal set Calendar SECOND  0       cal set Calendar MILLISECOND  0       cal set Calendar AM PM  Calendar AM

User · Answer

Using apache commons      For midnight today  Date today   new Date     DateUtils truncate today  Calendar DATE      For midnight tomorrow    Date tomorrow   DateUtils addDays today  1    DateUtils truncate tomorrow  Calendar DATE

User · Answer

Old fashioned way    private static Date getDateWithMidnight        long dateInMillis   new Date   getTime        return new Date dateInMillis - dateInMillis  1000 60 60 24  - TimeZone getDefault   getOffset dateInMillis

User · Answer

I know this is very old post  I thought to share my knowledge here     For the date Mid night today with exact Time zone you can use following   public static Date getCurrentDateWithMidnightTS         return new Date System currentTimeMillis   -  System currentTimeMillis    1000 60 60 24   -  1000 60   330        Where    1000 60   330  is being subtracted i e  actually related to time zone for example Indian time zone i e  kolkata differs  5 30hrs from actual   So subtracting  that with converting into milliseconds    So change last substracted number according  to you  I m creating a product i e  only based in India So just used specific timestamp

User · Answer

java time  If you are using Java 8 and later  you can try the java time package  Tutorial    LocalDate tomorrow   LocalDate now   plusDays 1   Date endDate   Date from tomorrow atStartOfDay ZoneId systemDefault    toInstant

[java] how to create a Java Date object of midnight today and midnight tomorrow?

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