How do I get a Date without time in Java

Question

Continuing from Stack Overflow question Java program to get the current date without timestamp   What is the most efficient way to get a Date object without the time  Is there any other way than these two      Method 1 SimpleDateFormat sdf   new SimpleDateFormat  yyyy-MM-dd    Date dateWithoutTime   sdf parse sdf format new Date          Method 2 Calendar cal   Calendar getInstance    cal set Calendar HOUR OF DAY  0   cal set Calendar MINUTE  0   cal set Calendar SECOND  0   cal set Calendar MILLISECOND  0   dateWithoutTime   cal getTime      Update    I knew about Joda-Time  I am just trying to avoid additional library for such a simple  I think  task  But based on the answers so far Joda-Time seems extremely popular  so I might consider it  By efficient  I mean I want to avoid temporary object String creation as used by method 1  meanwhile method 2 seems like a hack instead of a solution

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Well  as far as I know there is no easier way to achieve this if you only use the standard JDK   You can  of course  put that logic in method2 into a static function in a helper class  like done here in the toBeginningOfTheDay-method  Then you can shorten the second method to   Calendar cal   Calendar getInstance    Calendars toBeginningOfTheDay cal   dateWithoutTime   cal getTime      Or  if you really need the current day in this format so often  then you can just wrap it up in another static helper method  thereby making it a one-liner

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If you need the date part just for echoing purpose  then  Date d   new Date     String dateWithoutTime   d toString   substring 0  10

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If all you want is to see the date like so  YYYY-MM-DD  without all the other clutter e g   Thu May 21 12 08 18 EDT 2015  then just use java sql Date   This example gets the current date   new java sql Date System currentTimeMillis       Also java sql Date is a subclass of java util Date

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What about this   public static Date formatStrictDate int year  int month  int dayOfMonth        Calendar calendar   Calendar getInstance        calendar set year  month  dayOfMonth  0  0  0       calendar set Calendar MILLISECOND  0       return calendar getTime

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I just made this for my app    public static Date getDatePart Date dateTime        TimeZone tz   TimeZone getDefault        long rawOffset tz getRawOffset        long dst  tz inDaylightTime dateTime  tz getDSTSavings   0       long dt dateTime getTime   rawOffset dst     add offseet and dst to dateTime     long modDt dt    60 60 24 1000         return new Date  dt                     - modDt    substract the rest of the division by a day in milliseconds                     - rawOffset    substract the time offset  Paris   GMT  1h for example                      - dst    If dayLight  substract hours  Paris    1h in dayLight             Android API level 1  no external library  It respects daylight and default timeZone  No String manipulation so I think this way is more CPU efficient than yours but I haven t made any tests

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Here is what I used to get today s date with time set to 00 00 00   DateFormat formatter   new SimpleDateFormat  dd MM yyyy     Date today   new Date     Date todayWithZeroTime   formatter parse formatter format today

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If you just need the current date  without time  another option is   DateTime now   withTimeAtStartOfDay

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It does not make sense to talk about a date without a timestamp with regards to the Date routines in the standard java runtime  as it essentially maps down to a specific millisecond and not a date   Said millisecond intrinsically has a time of day attached to it which makes it vulnerable to timezone problems like Daylight Savings Time and other calendar adjustments     See Why is subtracting these two times  in 1927  giving a strange result  for an interesting example   If you want to work with dates instead of milliseconds  you need to use something else   For Java 8 there is a new set of methods providing exactly what you ask for   For Java 7 and earlier use http   www joda org joda-time

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You can use the DateUtils truncate from Apache Commons library   Example    DateUtils truncate new Date    java util Calendar DAY OF MONTH

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The most straightforward way   long millisInDay   60   60   24   1000  long currentTime   new Date   getTime    long dateOnly    currentTime   millisInDay    millisInDay  Date clearDate   new Date dateOnly

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09 28 2015 System out println new SimpleDateFormat  MM dd yyyy   format Calendar getInstance   getTime          Mon Sep 28 System out println  new Date   toString   substring 0  10         2015-09-28 System out println new java sql Date System currentTimeMillis          2015-09-28    java 8 System out println  LocalDate now ZoneId of  Europe Paris          rest zones id in ZoneId class

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Yo can use joda time   private Date dateWitoutTime Date date    return new LocalDate date  toDate       and you call with   Date date   new Date    System out println  Without Time       dateWitoutTime date      n  With time       date

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Prefer not to use third-party libraries as much as possible  I know that this way is mentioned before  but here is a nice clean way            Return values      -1     Date1  lt  Date2      0     Date1    Date2      1     Date1  gt  Date2      -2     Error    public int compareDates Date date1  Date date2        SimpleDateFormat sdf   new SimpleDateFormat  ddMMyyyy         try               date1   sdf parse sdf format date1            date2   sdf parse sdf format date2              catch  ParseException e            e printStackTrace            return -2             Calendar cal1   new GregorianCalendar        Calendar cal2   new GregorianCalendar         cal1 setTime date1       cal2 setTime date2        if cal1 equals cal2                 return 0            else if cal1 after cal2                 return 1            else if cal1 before cal2                 return -1             return -2      Well  not using GregorianCalendar is maybe an option

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Do you absolutely have to use java util Date  I would thoroughly recommend that you use Joda Time or the java time package from Java 8 instead  In particular  while Date and Calendar always represent a particular instant in time  with no such concept as  just a date   Joda Time does have a type representing this  LocalDate   Your code will be much clearer if you re able to use types which represent what you re actually trying to do   There are many  many other reasons to use Joda Time or java time instead of the built-in java util types - they re generally far better APIs  You can always convert to from a java util Date at the boundaries of your own code if you need to  e g  for database interaction

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The standard answer to these questions is to use Joda Time  The API is better and if you re using the formatters and parsers you can avoid the non-intuitive lack of thread safety of SimpleDateFormat    Using Joda means you can simply do   LocalDate d   new LocalDate      Update   Using java 8 this can be acheived using   LocalDate date   LocalDate now

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Is there any other way than these two    Yes  there is    LocalDate now       ZoneId of   Pacific Auckland         java time  Java 8 and later comes with the new java time package built-in  See Tutorial  Much of the java time functionality is back-ported to Java 6  amp  7 in ThreeTen-Backport and further adapted to Android in ThreeTenABP   Similar to Joda-Time  java time offers a LocalDate class to represent a date-only value without time-of-day and without time zone   Note that time zone is critical to determining a particular date  At the stroke of midnight in Paris  for example  the date is still    yesterday    in Montr  al    LocalDate today   LocalDate now  ZoneId of   America Montreal          By default  java time uses the ISO 8601 standard in generating a string representation of a date or date-time value   Another similarity with Joda-Time   So simply call toString   to generate text like 2015-05-21   String output   today toString          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   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  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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Check out Veyder-time  It is a simple and efficient alternative to both java util and Joda-time  It has an intuitive API and classes that represent dates alone  without timestamps

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Use LocalDate now   and convert into Date like below   Date from LocalDate now   atStartOfDay ZoneId systemDefault    toInstant

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This is a simple way of doing it   Calendar cal   Calendar getInstance    SimpleDateFormat dateOnly   new SimpleDateFormat  MM dd yyyy    System out println dateOnly format cal getTime

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The most straigthforward way that makes full use of the huge TimeZone Database of Java and is correct   long currentTime   new Date   getTime    long dateOnly   currentTime   TimeZone getDefault   getOffset currentTime

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Definitely not the most correct way  but if you just need a quick solution to get the date without the time and you do not wish to use a third party library this should do      Date db   db substring 0  10    db substring 23 28     I only needed the date for visual purposes and couldn t Joda so I substringed

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Here is a clean solution with no conversion to string and back  and also it doesn t re-calculate time several times as you reset each component of the time to zero  It also uses    modulus  rather than divide followed by multiply to avoid the double operation   It requires no third-party dependencies  and it RESPECTS THE TIMEZONE OF THE Calender object passed in  This function returns the moment in time at 12 AM in the timezone of the date  Calendar  you pass in   public static Calendar date only Calendar datetime        final long LENGTH OF DAY   24 60 60 1000      long millis   datetime getTimeInMillis        long offset   datetime getTimeZone   getOffset millis       millis   millis -   millis   offset    LENGTH OF DAY       datetime setTimeInMillis millis       return datetime

[java] How do I get a Date without time in Java?

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