Android Java - Date Difference in days

Question

I am getting the current date  in format 12 31 1999 i e  mm dd yyyy  as using the below code   Textview txtViewData  txtViewDate setText  Today is             android text format DateFormat getDateFormat this  format new Date        and I am having another date in format as  2010-08-25  i e  yyyy mm dd     so I want to find the difference between date in number of days  how do I find difference in days     In other words  I want to find the difference between CURRENT DATE - yyyy mm dd formatted date

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This is Simple and best calculation for me and may be for you           try                   String CurrDate    10 6 2013                   String PrvvDate    10 7 2013               Date date1   null              Date date2   null              SimpleDateFormat df   new SimpleDateFormat  M dd yyyy                date1   df parse CurrDate               date2   df parse PrvvDate               long diff   Math abs date1 getTime   - date2 getTime                 long diffDays   diff    24   60   60   1000                 System out println diffDays              catch  Exception e1                System out println  exception     e1

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There s a simple solution  that at least for me  is the only feasible solution   The problem is that all the answers I see being tossed around - using Joda  or Calendar  or Date  or whatever - only take the amount of milliseconds into consideration  They end up counting the number of 24-hour cycles between two dates  rather than the actual number of days  So something from Jan 1st 11pm to Jan 2nd 1am will return 0 days   To count the actual number of days between startDate and endDate  simply do      Find the sequential day from a date  essentially resetting time to start of the day long startDay   startDate getTime     1000   60   60   24  long endDay   endDate getTime     1000   60   60   24      Find the difference  duh long daysBetween   endDay - startDay    This will return  1  between Jan 2nd and Jan 1st  If you need to count the end day  just add 1 to daysBetween  I needed to do that in my code since I wanted to count the total number of days in the range    This is somewhat similar to what Daniel has suggested but smaller code I suppose

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use these functions      public static int getDateDifference int previousYear  int previousMonthOfYear  int previousDayOfMonth  int nextYear  int nextMonthOfYear  int nextDayOfMonth  int differenceToCount          int differenceToCount   can be any of the following         Calendar MILLISECOND          Calendar SECOND          Calendar MINUTE          Calendar HOUR          Calendar DAY OF MONTH          Calendar MONTH          Calendar YEAR          Calendar ----      Calendar previousDate   Calendar getInstance        previousDate set Calendar DAY OF MONTH  previousDayOfMonth          month is zero indexed so month should be minus 1     previousDate set Calendar MONTH  previousMonthOfYear       previousDate set Calendar YEAR  previousYear        Calendar nextDate   Calendar getInstance        nextDate set Calendar DAY OF MONTH  previousDayOfMonth          month is zero indexed so month should be minus 1     nextDate set Calendar MONTH  previousMonthOfYear       nextDate set Calendar YEAR  previousYear        return getDateDifference previousDate nextDate differenceToCount     public static int getDateDifference Calendar previousDate Calendar nextDate int differenceToCount          int differenceToCount   can be any of the following         Calendar MILLISECOND          Calendar SECOND          Calendar MINUTE          Calendar HOUR          Calendar DAY OF MONTH          Calendar MONTH          Calendar YEAR          Calendar ----        raise an exception if previous is greater than nextdate      if previousDate compareTo nextDate  gt 0           throw new RuntimeException  Previous Date is later than Nextdate               int difference 0      while previousDate compareTo nextDate  lt  0           difference            previousDate add differenceToCount 1             return difference

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Use the following functions                 Returns the number of days between two dates  The time part of the        days is ignored in this calculation  so 2007-01-01 13 00 and 2007-01-02 05 00        have one day inbetween              public static long daysBetween Date firstDate  Date secondDate               We only use the date part of the given dates         long firstSeconds   truncateToDate firstDate  getTime   1000          long secondSeconds   truncateToDate secondDate  getTime   1000             Just taking the difference of the millis             These will not be exactly multiples of 24 60 60  since there            might be daylight saving time somewhere inbetween  However  we can            say that by adding a half day and rounding down afterwards  we always            get the full days          long difference   secondSeconds-firstSeconds             Adding half a day         if  difference  gt   0                 difference    SECONDS PER DAY 2     plus half a day in seconds           else               difference -  SECONDS PER DAY 2     minus half a day in seconds                      Rounding down to days         difference    SECONDS PER DAY           return difference                        Truncates a date to the date part alone               SuppressWarnings  deprecation       public static Date truncateToDate Date d            if  d instanceof java sql Date                 return d     java sql Date is already truncated to date  And raises an                          Exception if we try to set hours  minutes or seconds                    d    Date d clone            d setHours 0           d setMinutes 0           d setSeconds 0           d setTime   d getTime   1000  1000            return d

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The Correct Way from Sam Quest s answer only works if the first date is earlier than the second  Moreover  it will return 1 if the two dates are within a single day   This is the solution that worked best for me  Just like most other solutions  it would still show incorrect results on two days in a year because of wrong day light saving offset   private final static long MILLISECS PER DAY   24   60   60   1000   long calculateDeltaInDays Calendar a  Calendar b            Optional  avoid cloning objects if it is the same day     if a get Calendar ERA     b get Calendar ERA                amp  amp  a get Calendar YEAR     b get Calendar YEAR               amp  amp  a get Calendar DAY OF YEAR     b get Calendar DAY OF YEAR             return 0            Calendar a2    Calendar  a clone        Calendar b2    Calendar  b clone        a2 set Calendar HOUR OF DAY  0       a2 set Calendar MINUTE  0       a2 set Calendar SECOND  0       a2 set Calendar MILLISECOND  0       b2 set Calendar HOUR OF DAY  0       b2 set Calendar MINUTE  0       b2 set Calendar SECOND  0       b2 set Calendar MILLISECOND  0       long diff   a2 getTimeInMillis   - b2 getTimeInMillis        long days   diff   MILLISECS PER DAY      return Math abs days

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Most of the answers were good and right for your problem of      so i want to find the difference between date in number of days  how do i find difference in days    I suggest this very simple and straightforward approach that is guaranteed to give you the correct difference in any time zone   int difference     int   startDate getTime    24 60 60 1000   - int  endDate getTime    24 60 60 1000        And that s it

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One another way   public static int numberOfDaysBetweenDates Calendar fromDay  Calendar toDay            fromDay   calendarStartOfDay fromDay           toDay   calendarStartOfDay toDay           long from   fromDay getTimeInMillis            long to   toDay getTimeInMillis            return  int  TimeUnit MILLISECONDS toDays to - from

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I found a very easy way to do this and it s what I m using in my app   Let s say you have the dates in Time objects  or whatever  we just need the milliseconds    Time date1   initializeDate1      get the date from somewhere Time date2   initializeDate2      get the date from somewhere  long millis1   date1 toMillis true   long millis2   date2 toMillis true    long difference   millis2 - millis1      now get the days from the difference and that s it long days   TimeUnit MILLISECONDS toDays difference      now you can do something like if days    7          do whatever when there s a week of difference    if days  gt   30          do whatever when it s been a month or more

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tl dr  ChronoUnit DAYS between       LocalDate parse   1999-12-28           LocalDate parse   12 31 1999    DateTimeFormatter ofPattern   MM dd yyyy           Details  Other answers are outdated  The old date-time classes bundled with the earliest versions of Java have proven to be poorly designed  confusing  and troublesome  Avoid them   java time  The Joda-Time project was highly successful as a replacement for those old classes  These classes provided the inspiration for the java time  framework built into Java 8 and later    Much of the java time functionality is back-ported to Java 6  amp  7 in ThreeTen-Backport and further adapted to Android in ThreeTenABP   LocalDate  The LocalDate class represents a date-only value without time-of-day and without time zone   Parsing strings  If your input strings are in standard ISO 8601 format  the LocalDate class can directly parse the string    LocalDate start   LocalDate parse   1999-12-28       If not in ISO 8601 format  define a formatting pattern with DateTimeFormatter   String input    12 31 1999   DateTimeFormatter formatter   DateTimeFormatter ofPattern   MM dd yyyy     LocalDate stop   LocalDate parse  input   formatter      Elapsed days via ChronoUnit  Now get a count of days elapsed between that pair of LocalDate objects  The ChronoUnit enum calculates elapsed time   long totalDays   ChronoUnit DAYS between  start   stop        If you are unfamiliar with Java enums  know they are far more powerful and useful that conventional enums in most other programming languages  See the Enum class doc  the Oracle Tutorial  and Wikipedia to learn more     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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Use jodatime API     Days daysBetween start toDateMidnight     end toDateMidnight     getDays      where  start  and  end  are your DateTime objects  To parse your date Strings into DateTime objects use the parseDateTime method  There is also an android specific JodaTime library

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Date userDob   new SimpleDateFormat  yyyy-MM-dd   parse dob           Date today   new Date            long diff    today getTime   - userDob getTime            int numOfDays    int   diff    1000   60   60   24            int hours    int   diff    1000   60   60            int minutes    int   diff    1000   60            int seconds    int   diff    1000

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This fragment accounts for daylight savings time and is O 1    private final static long MILLISECS PER DAY   24   60   60   1000   private static long getDateToLong Date date        return Date UTC date getYear    date getMonth    date getDate    0  0  0      public static int getSignedDiffInDays Date beginDate  Date endDate        long beginMS   getDateToLong beginDate       long endMS   getDateToLong endDate       long diff    endMS - beginMS     MILLISECS PER DAY       return  int diff     public static int getUnsignedDiffInDays Date beginDate  Date endDate        return Math abs getSignedDiffInDays beginDate  endDate

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All of these solutions suffer from one of two problems   Either the solution isn t perfectly accurate due to rounding errors  leap days and seconds  etc  or you end up looping over the number of days in between your two unknown dates   This solution solves the first problem  and improves the second by a factor of roughly 365  better if you know what your max range is           param thisDate     param thatDate     param maxDays               set to -1 to not set a max     returns number of days covered between thisDate and thatDate  inclusive  i e   counting both             thisDate and thatDate as an entire day  Will short out if the number of days exceeds             or meets maxDays     public static int daysCoveredByDates Date thisDate  Date thatDate  int maxDays          Check inputs     if  thisDate    null    thatDate    null            return -1               Set calendar objects     Calendar startCal   Calendar getInstance        Calendar endCal   Calendar getInstance        if  thisDate before thatDate             startCal setTime thisDate           endCal setTime thatDate             else           startCal setTime thatDate           endCal setTime thisDate                Get years and dates of our times      int startYear   startCal get Calendar YEAR       int endYear   endCal get Calendar YEAR       int startDay   startCal get Calendar DAY OF YEAR       int endDay   endCal get Calendar DAY OF YEAR          Calculate the number of days between dates   Add up each year going by until we catch up to endDate      while  startYear  lt  endYear  amp  amp  maxDays  gt   0  amp  amp  endDay - startDay   1  lt  maxDays            endDay    startCal getActualMaximum Calendar DAY OF YEAR     adds the number of days in the year startDate is currently in           startYear          startCal set Calendar YEAR  startYear     reup the year           int days   endDay - startDay   1         Honor the maximum  if set     if  maxDays  gt   0            days   Math min days  maxDays             return days      If you need days between dates  uninclusive of the latter date   just get rid of the   1 when you see endDay - startDay   1

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public void dateDifferenceExample                 Set the date for both of the calendar instance         GregorianCalendar calDate   new GregorianCalendar 2012  10  02 5 23 43           GregorianCalendar cal2   new GregorianCalendar 2015  04  02               Get the represented date in milliseconds         long millis1   calDate getTimeInMillis            long millis2   cal2 getTimeInMillis                Calculate difference in milliseconds         long diff   millis2 - millis1              Calculate difference in seconds         long diffSeconds   diff   1000              Calculate difference in minutes         long diffMinutes   diff    60   1000               Calculate difference in hours         long diffHours   diff    60   60   1000               Calculate difference in days         long diffDays   diff    24   60   60   1000       Toast makeText getContext       diffSeconds  Toast LENGTH SHORT  show

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Not really a reliable method  better of using JodaTime    Calendar thatDay   Calendar getInstance      thatDay set Calendar DAY OF MONTH 25     thatDay set Calendar MONTH 7      0-11 so 1 less   thatDay set Calendar YEAR  1985      Calendar today   Calendar getInstance       long diff   today getTimeInMillis   - thatDay getTimeInMillis      result in millis   Here s an approximation     long days   diff    24   60   60   1000     To Parse the date from a string  you could use    String strThatDay    1985 08 25     SimpleDateFormat formatter   new SimpleDateFormat  yyyy MM dd      Date d   null    try      d   formatter parse strThatDay    catch exception     catch  ParseException e          TODO Auto-generated catch block    e printStackTrace             Calendar thatDay   Calendar getInstance      thatDay setTime d     rest is the same       Although  since you re sure of the date format    You Could also do Integer parseInt   on it s Substrings to obtain their numeric values

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Joda-Time  Best way is to use Joda-Time  the highly successful open-source library you would add to your project     String date1    2015-11-11   String date2    2013-11-11   DateTimeFormatter formatter   new DateTimeFormat forPattern  yyyy-MM-dd    DateTime d1   formatter parseDateTime date1   DateTime d2   formatter parseDateTime date2   long diffInMillis   d2 getMillis   - d1 getMillis     Duration duration   new Duration d1  d2   int days   duration getStandardDays    int hours   duration getStandardHours    int minutes   duration getStandardMinutes      If you re using Android Studio  very easy to add joda-time   In your build gradle  app     dependencies     compile  joda-time joda-time 2 4    compile  joda-time joda-time 2 4    compile  joda-time joda-time 2 2

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This is NOT my work  found the answer here  did not want a broken link in the future     The key is this line for taking daylight setting into account  ref Full Code  TimeZone setDefault TimeZone getTimeZone  quot Europe London quot      or try passing TimeZone  as a parameter to daysBetween   and call setTimeZone   in the sDate and eDate objects  So here it goes  public static Calendar getDatePart Date date       Calendar cal   Calendar getInstance             get calendar instance     cal setTime date             cal set Calendar HOUR OF DAY  0                 set hour to midnight     cal set Calendar MINUTE  0                      set minute in hour     cal set Calendar SECOND  0                      set second in minute     cal set Calendar MILLISECOND  0                 set millisecond in second          return cal                                      return the date part    getDatePart   taken from here        This method also assumes endDate  gt   startDate     public static long daysBetween Date startDate  Date endDate      Calendar sDate   getDatePart startDate     Calendar eDate   getDatePart endDate      long daysBetween   0    while  sDate before eDate           sDate add Calendar DAY OF MONTH  1         daysBetween          return daysBetween     The Nuances  Finding the difference between two dates isn t as straightforward as subtracting the two dates and dividing the result by  24   60   60   1000   Infact  its erroneous  For example  The difference between the two dates 03 24 2007 and 03 25 2007 should be 1 day  However  using the above method  in the UK  you ll get 0 days  See for yourself  code below   Going the milliseconds way will lead to rounding off errors and they become most evident once you have a little thing like Daylight Savings Time come into the picture  Full Code  import java text SimpleDateFormat  import java util Calendar  import java util Date  import java util TimeZone   public class DateTest    public class DateTest    static SimpleDateFormat sdf   new SimpleDateFormat  quot dd-MMM-yyyy quot     public static void main String   args       TimeZone setDefault TimeZone getTimeZone  quot Europe London quot          diff between these 2 dates should be 1   Date d1   new Date  quot 01 01 2007 12 00 00 quot      Date d2   new Date  quot 01 02 2007 12 00 00 quot         diff between these 2 dates should be 1   Date d3   new Date  quot 03 24 2007 12 00 00 quot      Date d4   new Date  quot 03 25 2007 12 00 00 quot       Calendar cal1   Calendar getInstance   cal1 setTime d1     Calendar cal2   Calendar getInstance   cal2 setTime d2     Calendar cal3   Calendar getInstance   cal3 setTime d3     Calendar cal4   Calendar getInstance   cal4 setTime d4      printOutput  quot Manual    quot   d1  d2  calculateDays d1  d2      printOutput  quot Calendar  quot   d1  d2  daysBetween cal1  cal2      System out println  quot --- quot      printOutput  quot Manual    quot   d3  d4  calculateDays d3  d4      printOutput  quot Calendar  quot   d3  d4  daysBetween cal3  cal4        private static void printOutput String type  Date d1  Date d2  long result      System out println type   quot - Days between   quot    sdf format d1                         quot  and  quot    sdf format d2     quot  is   quot    result          Manual Method - YIELDS INCORRECT RESULTS - DO NOT USE       This method is used to find the no of days between the given dates    public static long calculateDays Date dateEarly  Date dateLater      return  dateLater getTime   - dateEarly getTime       24   60   60   1000          Using Calendar - THE CORRECT WAY    public static long daysBetween Date startDate  Date endDate             OUTPUT   Manual - Days between  01-Jan-2007 and 02-Jan-2007 is  1 Calendar - Days between  01-Jan-2007 and 02-Jan-2007 is  1  Manual - Days between  24-Mar-2007 and 25-Mar-2007 is  0 Calendar - Days between  24-Mar-2007 and 25-Mar-2007 is  1

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best and easiest way to do this    public int getDays String begin  throws ParseException        long MILLIS PER DAY   24   60   60   1000       SimpleDateFormat dateFormat   new SimpleDateFormat  dd-MM-yyyy   Locale ENGLISH        long begin   dateFormat parse begin  getTime        long end   new Date   getTime       2nd date want to compare     long diff    end - begin     MILLIS PER DAY       return  int  diff

[java] Android/Java - Date Difference in days

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