Number of days between two dates in Joda-Time

Question

How do I find the difference in Days between two Joda-Time DateTime instances  With    difference in days    I mean if start is on Monday and end is on Tuesday I expect a return value of 1 regardless of the hour minute seconds of the start and end dates   Days daysBetween start  end  getDays   gives me 0 if start is in the evening and end in the morning   I m also having the same issue with other date fields so I was hoping there would be a generic way to  ignore  the fields of lesser significance    In other words  the months between Feb and 4 March would also be 1  as would the hours between 14 45 and 15 12 be  However the hour difference between 14 01 and 14 55 would be 0

User · Answer

DateTime  dt    new DateTime laterDate            DateTime newDate   dt minus  new  DateTime   previousDate   getMillis      System out println  No of days       newDate getDayOfYear   - 1

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you can use LocalDate   Days daysBetween new LocalDate start   new LocalDate end   getDays

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java time Period  Use the java time Period class to count days   Since Java 8 calculating the difference is more intuitive using LocalDate  LocalDateTime to represent the two dates       LocalDate now   LocalDate now        LocalDate inputDate   LocalDate of 2018  11  28        Period period   Period between  inputDate  now       int diff   period getDays        System out println  diff       diff

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tl dr  java time temporal ChronoUnit DAYS between       earlier toLocalDate         later toLocalDate           or     java time temporal ChronoUnit HOURS between       earlier truncatedTo  ChronoUnit HOURS           later truncatedTo  ChronoUnit HOURS        java time  FYI  the Joda-Time project is now in maintenance mode  with the team advising migration to the java time classes    The equivalent of Joda-Time DateTime is ZonedDateTime   ZoneId z   ZoneId of   Pacific Auckland      ZonedDateTime now   ZonedDateTime now  z       Apparently you want to count the days by dates  meaning you want to ignore the time of day  For example  starting a minute before midnight and ending a minute after midnight should result in a single day  For this behavior  extract a LocalDate from your ZonedDateTime  The LocalDate class represents a date-only value without time-of-day and without time zone   LocalDate localDateStart   zdtStart toLocalDate     LocalDate localDateStop   zdtStop toLocalDate       Use the ChronoUnit enum to calculate elapsed days or other units   long days   ChronoUnit DAYS between  localDateStart   localDateStop       Truncate  As for you asking about a more general way to do this counting where you are interested the delta of hours as hour-of-the-clock rather than complete hours as spans-of-time of sixty minutes  use the truncatedTo method   Here is your example of 14 45 to 15 12 on same day   ZoneId z   ZoneId of   America Montreal      ZonedDateTime start   ZonedDateTime of  2017   1   17   14   45   0   0   z    ZonedDateTime stop   ZonedDateTime of  2017   1   17   15   12   0   0   z     long hours   ChronoUnit HOURS between  start truncatedTo  ChronoUnit HOURS     stop truncatedTo  ChronoUnit HOURS           1   This does not work for days  Use toLocalDate   in this case     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  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   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   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

Days Class  Using the Days class with the withTimeAtStartOfDay method should work   Days daysBetween start withTimeAtStartOfDay     end withTimeAtStartOfDay     getDays

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public static int getDifferenceIndays long timestamp1  long timestamp2        final int SECONDS   60      final int MINUTES   60      final int HOURS   24      final int MILLIES   1000      long temp      if  timestamp1  lt  timestamp2            temp   timestamp1          timestamp1   timestamp2          timestamp2   temp            Calendar startDate   Calendar getInstance TimeZone getDefault         Calendar endDate   Calendar getInstance TimeZone getDefault         endDate setTimeInMillis timestamp1       startDate setTimeInMillis timestamp2       if   timestamp1 - timestamp2   lt  1   HOURS   MINUTES   SECONDS   MILLIES            int day1   endDate get Calendar DAY OF MONTH           int day2   startDate get Calendar DAY OF MONTH           if  day1    day2                return 0            else               return 1                      int diffDays   0      startDate add Calendar DAY OF MONTH  diffDays       while  startDate before endDate             startDate add Calendar DAY OF MONTH  1           diffDays              return diffDays

User · Answer

Annoyingly  the withTimeAtStartOfDay answer is wrong  but only occasionally  You want   Days daysBetween start toLocalDate    end toLocalDate    getDays     It turns out that  midnight start of day  sometimes means 1am  daylight savings happen this way in some places   which Days daysBetween doesn t handle properly      5am on the 20th to 1pm on the 21st  October 2013  Brazil DateTimeZone BRAZIL   DateTimeZone forID  America Sao Paulo    DateTime start   new DateTime 2013  10  20  5  0  0  BRAZIL   DateTime end   new DateTime 2013  10  21  13  0  0  BRAZIL   System out println daysBetween start withTimeAtStartOfDay                                   end withTimeAtStartOfDay    getDays        prints 0 System out println daysBetween start toLocalDate                                   end toLocalDate    getDays        prints 1   Going via a LocalDate sidesteps the whole issue

User · Answer

The accepted answer builds two LocalDate objects  which are quite expensive if you are reading lot of data  I use this     public static int getDaysBetween DateTime earlier  DateTime later          return  int  TimeUnit MILLISECONDS toDays later getMillis  - earlier getMillis           By calling getMillis   you use already existing variables  MILLISECONDS toDays   then  uses a simple arithmetic calculation  does not create any object

[java] Number of days between two dates in Joda-Time

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