Compare two dates in Java

Question

I need to compare two dates in java  I am using the code like this   Date questionDate   question getStartDate    Date today   new Date     if today equals questionDate        System out println  Both are equals        This is not working  The content of the variables is the following    questionDate contains 2010-06-30 00 31 40 0   today contains Wed Jun 30 01 41 25 IST 2010   How can I resolve this

User · Answer

Here s what you can do for say yyyy-mm-dd comparison   GregorianCalendar gc  new GregorianCalendar    gc setTimeInMillis System currentTimeMillis     gc roll GregorianCalendar DAY OF MONTH  true    Date d1   new Date    Date d2   gc getTime     SimpleDateFormat sf  new SimpleDateFormat  yyyy-MM-dd     if sf format d2  hashCode    lt  sf format d1  hashCode          System out println  date 2 is less than date 1      else       System out println  date 2 is equal or greater than date 1

User · Answer

The easiest way to compare two dates is converting them to numeric value  like unix timestamp    You can use Date getTime   method that return the unix time   Date questionDate   question getStartDate    Date today   new Date    if  today getTime      questionDate getTime           System out println  Both are equals

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The following will return true if two Calendar variables have the same day of the year     public boolean isSameDay Calendar c1  Calendar c2       final int DAY 1000 60 60 24      return   c1 getTimeInMillis   DAY    c2 getTimeInMillis   DAY           end isSameDay

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Here is an another answer  You need to format the tow dates to fit the same fromat to be able to compare them as string       Date questionDate   question getStartDate        Date today   new Date         SimpleDateFormat dateFormatter   new SimpleDateFormat   yyyy MM dd         String questionDateStr   dateFormatter format questionDate       String todayStr   dateFormatter format today        if questionDateStr equals todayStr             System out println  Both are equals

User · Answer

java time  In Java 8 there is no need to use Joda-Time as it comes with a similar new API in the java time package  Use the LocalDate class   LocalDate date   LocalDate of 2014  3  18   LocalDate today   LocalDate now     Boolean isToday   date isEqual  today      You can ask for the span of time between the dates with Period class   Period difference   Period between date  today     LocalDate is comparable using equals and compareTo as it holds no information about Time and Timezone     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

User · Answer

it is esy using time compareTo currentTime   lt  0  import java util Calendar  import java util Date  import java util Timer  import java util TimerTask   public class MyTimerTask       static Timer singleTask   new Timer          SuppressWarnings  deprecation       public static void main String args                 set download schedule time         Calendar calendar   Calendar getInstance            calendar set Calendar HOUR OF DAY  9           calendar set Calendar MINUTE  54           calendar set Calendar SECOND  0           Date time    Date  calendar getTime               get current time         Date currentTime   new Date               if current time gt  time schedule set for next day         if  time compareTo currentTime   lt  0                 time setDate time getDate     1             else                  do nothing                   singleTask schedule new TimerTask                  Override             public void run                     System out println  timer task is runing                             time

User · Answer

This is a very old post though sharing my work  Here is a little trick to do so   DateTime dtStart   new DateTime Dateforcomparision    DateTime dtNow   new DateTime      current date  if dtStart getMillis    lt   dtNow getMillis           to do     use comparator as per your requirement

User · Answer

in my case  I just had to do something like this     date1 toString   equals date2 toString      And it worked

User · Answer

It s not clear to me what you want  but I ll mention that the Date class also has a compareTo method  which can be used to determine with one call if two Date objects are equal or  if they aren t equal  which occurs sooner   This allows you to do something like   switch  today compareTo questionDate         case -1   System out println  today is sooner than questionDate     break      case 0    System out println  today and questionDate are equal     break      case 1    System out println  today is later than questionDate     break      default   System out println  Invalid results from date comparison    break      It should be noted that the API docs don t guarantee the results to be -1  0  and 1  so you may want to use if-elses rather than a switch in any production code  Also  if the second date is null  you ll get a NullPointerException  so wrapping your code in a try-catch may be useful

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public static double periodOfTimeInMillis Date date1  Date date2        return  date2 getTime   - date1 getTime        public static double periodOfTimeInSec Date date1  Date date2        return  date2 getTime   - date1 getTime      1000     public static double periodOfTimeInMin Date date1  Date date2        return  date2 getTime   - date1 getTime       60   1000      public static double periodOfTimeInHours Date date1  Date date2        return  date2 getTime   - date1 getTime       60   60   1000      public static double periodOfTimeInDays Date date1  Date date2        return  date2 getTime   - date1 getTime       24   60   60   1000L

User · Answer

It works best      Calendar cal1   Calendar getInstance    Calendar cal2   Calendar getInstance     cal1 setTime date1   cal2 setTime date2    boolean sameDay   cal1 get Calendar YEAR     cal2 get Calendar YEAR   amp  amp  cal1 get Calendar DAY OF YEAR     cal2 get Calendar DAY OF YEAR

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Date equality depends on the two dates being equal to the millisecond  Creating a new Date object using new Date   will never equal a date created in the past  Joda Time s APIs simplify working with dates  however  using the Java s SDK alone   if  removeTime questionDate  equals removeTime today           public Date removeTime Date 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         return cal getTime

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public long compareDates Date exp  Date today            long b    exp getTime  -86400000  86400000          long c    today getTime  -86400000  86400000          return b-c          This works for GregorianDates  86400000 are the amount of milliseconds in a day  this will return the number of days between the two dates

User · Answer

I would use JodaTime for this  Here is an example - lets say you want to find the difference in days between 2 dates   DateTime startDate   new DateTime some date    DateTime endDate   new DateTime      current date Days diff   Days daysBetween startDate  endDate   System out println diff getDays       JodaTime can be downloaded from here

[java] Compare two dates in Java

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