Java Calendar: Subtract two Dates to get difference in days between the two -

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• calculating difference between 2 java date instances 43 answers

i want check how many days has been since user logged in:

calendar lastlogin = calendar.getinstance(); lastlogin.settime(randomplayer.getlastlogin()); calendar today = calendar.getinstance(); 

how subtract difference in days between two? i.e number of days since last login.

i suggest using localdate instead:

import java.time.localdate; import java.time.temporal.chronounit;  public class daysbetween {      public static void main(string[] args) {         localdate lastlogin = localdate.of(2017, 4, 1);         localdate today = localdate.now();         system.out.println(daysbetween(lastlogin, today));     }      private static long daysbetween(localdate from, localdate to) {         return chronounit.days.between(from, to);     } } 

or, if really want stick calendar:

import java.time.temporal.chronounit; import java.util.calendar;  public class daysbetween {      public static void main(string[] args) {         calendar lastlogin = calendar.getinstance();         lastlogin.set(calendar.year, 2017);         lastlogin.set(calendar.month, 3);         lastlogin.set(calendar.day_of_month, 1);         calendar today = calendar.getinstance();         system.out.println(daysbetween(lastlogin, today));     }      private static long daysbetween(calendar from, calendar to) {         return chronounit.days.between(from.toinstant(), to.toinstant());     } }