Java Date difference in terms of days

Question

Could anyone please help me out for calculating Date difference in terms of no of days in an efficient way?

Date nextCollectionDate = dispenseNormal.getDispensing().getNextCollectionDate();
Date currentDate = new Date();
int daysDiff = currentDate - nextCollectionDate;

Answer 1

//diff in msec
long diff = currentDate.getTime() - nextCollectionDate.getTime();

//diff in days
long days = diff / (24 * 60 * 60 * 1000);

Answer 2

You can use JodaTime which is a very useful API for these scenarios

int days = Days.daysBetween(date1, date2).getDays();

or else you can create your own method and get the difference

public long getDays(Date d1, Date d2) 
{
    long l = d2.getTime() - d1.getTime();
    return TimeUnit.DAYS.convert(l, TimeUnit.MILLISECONDS);
}

Answer 3

I would suggest you to use LocalDate in Java 8:

LocalDate startDate = LocalDate.now().minusDays(1);
LocalDate endDate = LocalDate.now();
long days = Period.between(startDate, endDate).getDays();
System.out.println("No of days: " + days);

which as expected will print:

No of days: 1

Answer 4

You can use joda api

Below code should solve your query

 Date nextCollectionDate = dispenseNormal.getDispensing().getNextCollectionDate();
    Date currentDate = new Date();
    Days  d = Days.daysBetween(new DateTime(nextCollectionDate ), new DateTime(currentDate ))

    int daysDiff = d.getDays();