How to compare two Dates without the time portion

Question

I would like to have a compareTo method that ignores the time portion of a java util Date  I guess there are a number of ways to solve this  What s the simplest way

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Using the getDateInstance of SimpleDateFormat  we can compare only two date object without time  Execute the below code   public static void main String   args                    Date date1    new Date            Date date2    new Date            DateFormat dfg   SimpleDateFormat getDateInstance DateFormat DATE FIELD           String dateDtr1   dfg format date1           String dateDtr2   dfg format date2           System out println dateDtr1       dateDtr2           System out println dateDtr1 equals dateDtr2

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public static Date getZeroTimeDate Date fecha        Date res   fecha      Calendar calendar   Calendar getInstance         calendar setTime  fecha        calendar set Calendar HOUR OF DAY  0       calendar set Calendar MINUTE  0       calendar set Calendar SECOND  0       calendar set Calendar MILLISECOND  0        res   calendar getTime         return res     Date currentDate   getZeroTimeDate new Date       get current date      this is the simplest way to solve this problem

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Here is a solution from this blog  http   brigitzblog blogspot com 2011 10 java-compare-dates html  long milliseconds1   calendar1 getTimeInMillis    long milliseconds2   calendar2 getTimeInMillis    long diff   milliseconds2 - milliseconds1  long diffDays   diff    24   60   60   1000   System out println  Time in days      diffDays      days       i e  you can see if the time difference in milliseconds is less than the length of one day

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If you re using Java 8  you should use the java time   classes to compare dates - it s preferred to the various java util   classes  eg  https   docs oracle com javase 8 docs api java time LocalDate html  LocalDate date1   LocalDate of 2016  2  14   LocalDate date2   LocalDate of 2015  5  23   date1 isAfter date2

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Apache commons-lang is almost ubiquitous  So what about this   if  DateUtils isSameDay date1  date2            it s same   else if  date1 before date2           it s before   else         it s after

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This is what worked for me   var Date1   new Date dateObject1 toDateString       this sets time to 00 00 00 var Date2   new Date dateObject2 toDateString        do a normal compare if Date1  gt  Date2     do something

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First  be aware that this operation depends on the time zone  So choose whether you want to do it in UTC  in the computer   s time zone  in your own favourite time zone or where  If you are not yet convinced it matters  see my example at the bottom of this answer   Since your question isn   t quite clear about this  I am assuming that you have a class with an instance field representing a point in time and implementing Comparable  and you want the natural ordering of your objects to be by the date  but not the time  of that field  For example   public class ArnesClass implements Comparable lt ArnesClass gt         private static final ZoneId arnesTimeZone   ZoneId systemDefault         private Instant when        Override     public int compareTo ArnesClass o               question is what to put here            Java 8 java time classes  I have taken the freedom of changing the type of your instance field from Date to Instant  the corresponding class in Java 8  I promise to return to the treatment of Date below  I have also added a time zone constant  You may set it to ZoneOffset UTC or ZoneId of  Europe Stockholm   or what you find appropriate  setting it to a ZoneOffset works because ZoneOffset is a subclass of ZoneId    I have chosen to show the solution using the Java 8 classes  You asked for the simplest way  right   -  Here   s the compareTo method you asked for   public int compareTo ArnesClass o        LocalDate dateWithoutTime   when atZone arnesTimeZone  toLocalDate        LocalDate otherDateWithoutTime   o when atZone arnesTimeZone  toLocalDate        return dateWithoutTime compareTo otherDateWithoutTime       If you never need the time part of when  it is of course easier to declare when a LocalDate and skip all conversions  Then we don   t have to worry about the time zone anymore either   Now suppose that for some reason you cannot declare your when field an Instant or you want to keep it an old-fashioned Date  If you can still use Java 8  just convert it to Instant  then do as before       LocalDate dateWithoutTime   when toInstant   atZone arnesTimeZone  toLocalDate      Similarly for o when   No Java 8   If you cannot use java 8  there are two options    Solve it using one of the old classes  either Calendar or SimpleDateFormat  Use the backport of the Java 8 date and time classes to Java 6 and 7  then just do as above  I include a link at the bottom  Do not use JodaTime  JodaTime was probably a good suggestion when the answers recommending it were written  but JodaTime is now in maintenance mode  so the ThreeTen backport is a better and more futureproof option    The old-fashioned ways  Adamski   s answer shows you how to strip the time part off a Date using the Calendar class  I suggest you use getInstance TimeZone  to obtain the Calendar instance for the time zone you want  As an alternative you may use the idea from the second half of Jorn   s answer   Using SimpleDateFormat is really an indirect way of using Calendar since a SimpleDateFormat contains a Calendar object  However  you may find it less troublesome than using Calendar directly   private static final TimeZone arnesTimeZone   TimeZone getTimeZone  Europe Stockholm    private static final DateFormat formatter   new SimpleDateFormat  yyyyMMdd    static       formatter setTimeZone arnesTimeZone      private Date when    Override public int compareTo ArnesClass o        return formatter format when  compareTo formatter format o when        This was inspired by Rob   s answer   Time zone dependency  Why do we have to pick a specific time zone  Say that we want to compare two times that in UTC are March 24 0 00  midnight  and 12 00  noon   If you do that in CET  say  Europe Paris   they are 1 am and 1 pm on March 24  that is  the same date  In New York  Eastern Daylight Time   they are 20 00 on March 23 and 8 00 on March 24  that is  not the same date  So it makes a difference which time zone you pick  If you just rely on the computer   s default  you may be in for surprises when someone tries to run your code on a computer in another place in this globalized world   Link  Link to ThreeTen Backport  the backport of the Java 8 date and time classes to Java 6 and 7  http   www threeten org threetenbp

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In Java 8 you can use LocalDate which is very similar to the one from Joda Time

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I too prefer Joda Time  but here s an alternative   long oneDay   24   60   60   1000 long d1   first getTime     oneDay long d2   second getTime     oneDay d1    d2   EDIT  I put the UTC thingy below in case you need to compare dates for a specific timezone other than UTC  If you do have such a need  though  then I really advise going for Joda   long oneDay   24   60   60   1000 long hoursFromUTC   -4   60   60   1000    EST with Daylight Time Savings long d1    first getTime     hoursFromUTC    oneDay long d2    second getTime     hoursFromUTC    oneDay d1    d2

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Update  while Joda Time was a fine recommendation at the time  use the java time library from Java 8  instead where possible     My preference is to use Joda Time which makes this incredibly easy   DateTime first        DateTime second         LocalDate firstDate   first toLocalDate    LocalDate secondDate   second toLocalDate     return firstDate compareTo secondDate     EDIT  As noted in comments  if you use DateTimeComparator getDateOnlyInstance   it s even simpler        TODO  consider extracting the comparator to a field  return DateTimeComparator getDateOnlyInstance   compare first  second       Use Joda Time  is the basis of almost all SO questions which ask about java util Date or java util Calendar  It s a thoroughly superior API  If you re doing anything significant with dates times  you should really use it if you possibly can    If you re absolutely forced to use the built in API  you should create an instance of Calendar with the appropriate date and using the appropriate time zone  You could then set each field in each calendar out of hour  minute  second and millisecond to 0  and compare the resulting times  Definitely icky compared with the Joda solution though     The time zone part is important  java util Date is always based on UTC  In most cases where I ve been interested in a date  that s been a date in a specific time zone  That on its own will force you to use Calendar or Joda Time  unless you want to account for the time zone yourself  which I don t recommend    Quick reference for android developers      Add joda library dependency to your build gradle file dependencies                 implementation  joda-time joda-time 2 9 9      Sample code  example   DateTimeComparator dateTimeComparator   DateTimeComparator getDateOnlyInstance     Date myDateOne        Date myDateTwo         int retVal   dateTimeComparator compare myDateOne  myDateTwo    if retVal    0       both dates are equal else if retVal  lt  0       myDateOne is before myDateTwo else if retVal  gt  0       myDateOne is after myDateTwo

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If you just want to compare only two dates without time  then following code might help you   final SimpleDateFormat dateFormat   new SimpleDateFormat  yyyyMMdd    Date dLastUpdateDate   dateFormat parse 20111116   Date dCurrentDate   dateFormat parse dateFormat format new Date      if  dCurrentDate after dLastUpdateDate        add your logic

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I don t know it is new think or else  but i show you as i done  SimpleDateFormat dtf   new SimpleDateFormat  dd MM yyyy    Date td date   new Date    String first date   dtf format td date        First seted in String  String second date    30 11 2020              Second date you can set hear in String  String result    first date equals second date      Yes  Its Equals   No  It is not Equals   System out println result

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If you really want to use the java util Date  you would do something like this   public class TimeIgnoringComparator implements Comparator lt Date gt      public int compare Date d1  Date d2        if  d1 getYear      d2 getYear             return d1 getYear   - d2 getYear        if  d1 getMonth      d2 getMonth             return d1 getMonth   - d2 getMonth        return d1 getDate   - d2 getDate            or  using a Calendar instead  preferred  since getYear   and such are deprecated   public class TimeIgnoringComparator implements Comparator lt Calendar gt      public int compare Calendar c1  Calendar c2        if  c1 get Calendar YEAR     c2 get Calendar YEAR            return c1 get Calendar YEAR  - c2 get Calendar YEAR       if  c1 get Calendar MONTH     c2 get Calendar MONTH            return c1 get Calendar MONTH  - c2 get Calendar MONTH       return c1 get Calendar DAY OF MONTH  - c2 get Calendar DAY OF MONTH

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If you strictly want to use Date   java util Date    or without any use of external Library  Use this   public Boolean compareDateWithoutTime Date d1  Date d2        SimpleDateFormat sdf   new SimpleDateFormat  quot yyyyMMdd quot        return sdf format d1  equals sdf format d2

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Another solution using Java 8 and Instant  is using the truncatedTo method     Returns a copy of this Instant truncated to the specified unit    Example    Test public void dateTruncate   throws InterruptedException       Instant now   Instant now        Thread sleep 1000 5       Instant later   Instant now        assertThat now  not equalTo later         assertThat now truncatedTo ChronoUnit DAYS   equalTo later truncatedTo ChronoUnit DAYS

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Using http   mvnrepository com artifact commons-lang commons-lang  Date date1   new Date     Date date2   new Date     if  DateUtils truncatedCompareTo date1  date2  Calendar DAY OF MONTH     0         TRUE else        FALSE

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SimpleDateFormat sdf  new SimpleDateFormat  MM dd yyyy       Date date1 sdf parse  03 25 2015         Date currentDate  sdf parse sdf format new Date          return date1 compareTo currentDate

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Already mentioned apache commons-utils   org apache commons lang time DateUtils truncate date  Calendar DAY OF MONTH    gives you Date object containing only date  without time  and you can compare it with Date compareTo

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I am afraid there is no method of comparing two dates that could be called  easy  or  simple    When comparing two time instances with any sort of reduced precision  e g  just comparing dates   you must always take into account how time zone affects the comparison   If date1 is specifying an event that occurred in  2 timezone and date2 is specifying an event that occurred in EST  for example  you must take care to properly understand the implications of the comparison   Is your purpose to figure out if the two events occurred in the same calendar date in their own respective time zones  Or do You need to know if the two dates fall into the same calendar date in a specific time zone  UTC or your local TZ  for example    Once you figure out what it is actually that You are trying to compare  it is just a matter of getting the year-month-date triple in an appropriate time zone and do the comparison   Joda time might make the actual comparison operation look much cleaner  but the semantics of the comparison are still something You need to figure out yourself

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I solved this by comparing by timestamp       Calendar last   Calendar getInstance         last setTimeInMillis firstTimeInMillis        Calendar current   Calendar getInstance         if  last get Calendar DAY OF MONTH     current get Calendar DAY OF MONTH               not the same day         I avoid to use Joda Time because on Android uses a huge space  Size matters

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If you want to compare only the month  day and year of two dates  following code works for me   SimpleDateFormat sdf   new SimpleDateFormat  yyyyMMdd    sdf format date1  equals sdf format date2      Thanks Rob

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Simply Check DAY OF YEAR in combination with YEAR property  boolean isSameDay    firstCal get Calendar YEAR     secondCal get Calendar YEAR   amp  amp  firstCal get Calendar DAY OF YEAR     secondCal get Calendar DAY OF YEAR    EDIT   Now we can use the power of Kotlin extension functions  fun Calendar isSameDay second  Calendar   Boolean        return this Calendar YEAR     second Calendar YEAR   amp  amp  this Calendar DAY OF YEAR     second Calendar DAY OF YEAR     fun Calendar compareDatesOnly other  Calendar   Int        return when           isSameDay other  - gt  0         before other  - gt  -1         else - gt  1

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My preference would be to use the Joda library insetad of java util Date directly  as Joda makes a distinction between date and time  see YearMonthDay and DateTime classes    However  if you do wish to use java util Date I would suggest writing a utility method  e g   public static Date setTimeToMidnight 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

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tl dr  myJavaUtilDate1 toInstant                   atZone  ZoneId of   America Montreal                      toLocalDate                   isEqual                      myJavaUtilDate2 toInstant                                      atZone  ZoneId of   America Montreal                                         toLocalDate                      Avoid legacy date-time classes  Avoid the troublesome old legacy date-time classes such as Date  amp  Calendar  now supplanted by the java time classes   Using java time  A java util Date represents a moment on the timeline in UTC  The equivalent in java time is Instant  You may convert using new methods added to the legacy class   Instant instant1   myJavaUtilDate1 toInstant    Instant instant2   myJavaUtilDate2 toInstant      You want to compare by date  A time zone is crucial in determining a date  For any given moment  the date varies around the globe by zone  For example  a few minutes after midnight in Paris France is a new day while still    yesterday    in Montr  al Qu  bec   Specify a proper time zone name in the format of continent region  such as America Montreal  Africa Casablanca  or Pacific Auckland  Never use the 3-4 letter abbreviation such as EST or IST as they are not true time zones  not standardized  and not even unique       ZoneId z   ZoneId of   America Montreal       Apply the ZoneId to the Instant to get a ZonedDateTime   ZonedDateTime zdt1   instant1 atZone  z    ZonedDateTime zdt2   instant2 atZone  z      The LocalDate class represents a date-only value without time-of-day and without time zone  We can extract a LocalDate from a ZonedDateTime  effectively eliminating the time-of-day portion   LocalDate localDate1   zdt1 toLocalDate    LocalDate localDate2   zdt2 toLocalDate      Now compare  using methods such as isEqual  isBefore  and isAfter   Boolean sameDate   localDate1 isEqual  localDate2      See this code run live at IdeOne com      instant1  2017-03-25T04 13 10 971Z   instant2  2017-03-24T22 13 10 972Z      zdt1  2017-03-25T00 13 10 971-04 00 America Montreal    zdt2  2017-03-24T18 13 10 972-04 00 America Montreal       localDate1  2017-03-25   localDate2  2017-03-24      sameDate  false     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 and 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 SE 7   Much of the java time functionality is back-ported to Java 6  amp  7 in ThreeTen-Backport   Android   The ThreeTenABP project adapts ThreeTen-Backport  mentioned above  for Android specifically  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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public Date saveDateWithoutTime Date date        Calendar calendar   Calendar getInstance         calendar setTime  date        calendar set Calendar HOUR OF DAY  0       calendar set Calendar HOUR  0       calendar set Calendar MINUTE  0       calendar set Calendar SECOND  0       calendar set Calendar MILLISECOND  0        return calendar getTime        This will help you to compare dates without considering the time

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How about DateUtil daysBetween    It s Java and it returns a number  difference in days

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Any opinions on this alternative   SimpleDateFormat sdf   new SimpleDateFormat  yyyyMMdd    sdf format date1  equals sdf format date2

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My proposition       Calendar cal   Calendar getInstance        cal set 1999 10 01        nov 1st  1999     cal set Calendar AM PM Calendar AM       cal set Calendar HOUR 0       cal set Calendar MINUTE 0       cal set Calendar SECOND 0       cal set Calendar MILLISECOND 0           date column in the Thought table is of type sql date     Thought thought   thoughtDao getThought date  language        Assert assertEquals cal getTime    thought getDate

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Another Simple compare method based on the answers here and my mentor guidance  public static int compare Date d1  Date d2        Calendar c1   Calendar getInstance        Calendar c2   Calendar getInstance        c1 setTime d1       c1 set Calendar MILLISECOND  0       c1 set Calendar SECOND  0       c1 set Calendar MINUTE  0       c1 set Calendar HOUR OF DAY  0       c2 setTime d2       c2 set Calendar MILLISECOND  0       c2 set Calendar SECOND  0       c2 set Calendar MINUTE  0       c2 set Calendar HOUR OF DAY  0       return c1 getTime   compareTo c2 getTime           EDIT   According to  Jonathan Drapeau  the code above fail some cases  I would like to see those cases  please  and he suggested the following as I understand   public static int compare2 Date d1  Date d2        Calendar c1   Calendar getInstance        Calendar c2   Calendar getInstance        c1 clear        c2 clear        c1 set Calendar YEAR  d1 getYear         c1 set Calendar MONTH  d1 getMonth         c1 set Calendar DAY OF MONTH  d1 getDay         c2 set Calendar YEAR  d2 getYear         c2 set Calendar MONTH  d2 getMonth         c2 set Calendar DAY OF MONTH  d2 getDay         return c1 getTime   compareTo c2 getTime         Please notice that  the Date class is deprecated cause it was not amenable to internationalization  The Calendar class is used instead

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Using Apache commons you can do   import org apache commons lang3 time DateUtils  DateUtils truncatedEquals first  second  Calendar DAY OF MONTH

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Create one day 00 00 00 calendar int oneDayTimeStamp   1523017440  Calendar oneDayCal   Calendar getInstance    oneDayCal setTimeInMillis oneDayTimeStamp   1000L   oneDayCal set Calendar HOUR OF DAY  0   oneDayCal set Calendar MINUTE  0   oneDayCal set Calendar SECOND  0   oneDayCal set Calendar MILLISECOND  0       Create current day 00 00 00 calendar Calendar currentCal   Calendar getInstance    currentCal set Calendar HOUR OF DAY  0   currentCal set Calendar MINUTE  0   currentCal set Calendar SECOND  0   currentCal set Calendar MILLISECOND  0    if  oneDayCal compareTo currentCal     0           Same day  excluding time

[java] How to compare two Dates without the time portion?

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