Get Today s date in Java at midnight time

Question

I need to create two date objects  If the current date and time is March 9th 2012 11 30 AM then         date object d1 should be 9th March 2012 12 00 AM   date object d2 should contain the current date itself      The date will not be entered  it is system date   Update    Date dt   new Date    System out print dt toString       gives current date and time

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If you are able to add external libs to your project  I would recommend that you try out Joda-time  It has a very clever way of working with dates   http   joda-time sourceforge net

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private static Date truncateTime Calendar cal            cal set Calendar HOUR OF DAY  0           cal set Calendar MINUTE  0           cal set Calendar SECOND  0           cal set Calendar MILLISECOND  0           return new Date cal getTime   getTime        public static void main String   args  throws Exception          Date d2   new Date            GregorianCalendar cal   new GregorianCalendar            cal setTime d2           Date d1   truncateTime  cal            System out println d1 toString             System out println d2 toString

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Defining    Midnight     The word    midnight    is tricky to define    Some think of it as the moment before a new day starts  Trying to represent that in software as tricky as the last moment of the day can always be subdivided as a smaller fraction of a second    I suggest a better way of thinking about this is to get    first moment of the day       This supports the commonly used approach of defining  a span of time as    Half-Open     where the beginning is inclusive while the ending is exclusive  So a full day starts with the first moment of the day and runs up to  but not including  the first moment of the following day  A full day would like this  notice the date going from the 3rd to the 4th       2016-02-03T00 00 00 0-08 00 America Los Angeles  2016-02-04T00 00 00 0-08 00 America Los Angeles    Joda-Time  If using the Joda-Time library  call withTimeAtStartOfDay   Note how we specify the time zone  If omitted  the JVM   s current default time zone is implicitly applied  Better to be explicit    DateTime todayStart   DateTime now  DateTimeZone forID   America Montreal      withTimeAtStartOfDay       If using Java 8 or later  better to use the java time package built into Java  See sibling Answer by Jens Hoffman

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Here is a Java 8 based solution  using the new java time package  Tutorial   If you can use Java 8 objects in your code  use LocalDateTime   LocalDateTime now   LocalDateTime now       current date and time LocalDateTime midnight   now toLocalDate   atStartOfDay       If you require legacy dates  i e  java util Date   Convert the LocalDateTime you created above to Date using these conversions      LocalDateTime -  ZonedDateTime -  Instant -  Date    Call atZone zone  with a specified time-zone  or ZoneId systemDefault   for the system default time-zone  to create a ZonedDateTime object  adjusted for DST as needed   ZonedDateTime zdt   midnight atZone ZoneId of  America Montreal      Call toInstant   to convert the ZonedDateTime to an Instant   Instant i   zdt toInstant    Finally  call Date from instant  to convert the Instant to a Date   Date d1   Date from i      In summary it will look similar to this for you   LocalDateTime now   LocalDateTime now       current date and time LocalDateTime midnight   now toLocalDate   atStartOfDay    Date d1   Date from midnight atZone ZoneId systemDefault    toInstant     Date d2   Date from now atZone ZoneId systemDefault    toInstant        See also section Legacy Date-Time Code  The Java    Tutorials  for interoperability of the new java time functionality with legacy java util classes

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A solution in Java 8   Date startOfToday   Date from ZonedDateTime now   with LocalTime MIN  toInstant

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Using org apache commons lang3 time DateUtils  Date pDate   new Date    DateUtils truncate pDate  Calendar DAY OF MONTH

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For Current Date and Time    String mydate   java text DateFormat getDateTimeInstance   format Calendar getInstance   getTime       This will shown as    Feb 5  2013 12 40 24PM

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Date date   new Date    SimpleDateFormat sdf   new SimpleDateFormat  yyyy MM dd HH mm    System out println sdf format date

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DateFormat dateFormat   new SimpleDateFormat  yyyy MM dd HH mm ss        Date date   new Date    System out println dateFormat format date         2014 08 06 15 59 4

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Calendar c   new GregorianCalendar        c set Calendar HOUR OF DAY  0     anything 0 - 23     c set Calendar MINUTE  0       c set Calendar SECOND  0       Date d1   c getTime      the midnight  that s the first second of the day    should be Fri Mar 09 00 00 00 IST 2012

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Here is a Java 8 way to get UTC Midnight in millis  ZonedDateTime utcTime   ZonedDateTime now ZoneOffset UTC   long todayMidnight   utcTime toLocalDate   atStartOfDay   toEpochSecond ZoneOffset UTC    1000

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Calendar currentDate   Calendar getInstance      Get the current date SimpleDateFormat formatter  new SimpleDateFormat  yyyy MMM dd HH mm ss      format it as per your requirement String dateNow   formatter format currentDate getTime     System out println  Now the date is    gt       dateNow

[java] Get Today's date in Java at midnight time

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