Subtract two dates in Java

Question

Possible Duplicate    Calculating the Difference Between Two Java Date Instances       I know this might be a duplicate thread  But I am trying to figure out a way to compute the difference between two dates  From jquery the date string is in the format  yyyy-mm-dd   I read this as a String and converted to java Date like this  Date d1   new SimpleDateFormat  yyyy-M-dd   parse  String  request getParameter date1    Date d2   new SimpleDateFormat  yyyy-M-dd   parse  String  request getParameter date2      I want to compute the difference in the number of days between these two dates   Note  I cannot use third party API s as those need to reviewed

User · Answer

Assuming that you re constrained to using Date  you can do the following   Date diff   new Date d2 getTime   - d1 getTime      Here you re computing the differences in milliseconds since the  epoch   and creating a new Date object at an offset from the epoch   Like others have said  the answers in the duplicate question are probably better alternatives  if you aren t tied down to Date

User · Answer

Date d1   new SimpleDateFormat  yyyy-M-dd   parse  String  request              getParameter date1    Date d2   new SimpleDateFormat  yyyy-M-dd   parse  String  request              getParameter date2     long diff   d2 getTime   - d1 getTime     System out println  Difference between      d1     and    d2   is              diff    1000   60   60   24       days

User · Answer

Edit 2018-05-28 I have changed the example to use Java 8 s Time API   LocalDate d1   LocalDate parse  2018-05-26   DateTimeFormatter ISO LOCAL DATE   LocalDate d2   LocalDate parse  2018-05-28   DateTimeFormatter ISO LOCAL DATE   Duration diff   Duration between d1 atStartOfDay    d2 atStartOfDay     long diffDays   diff toDays

[java] Subtract two dates in Java

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