Question

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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.

Answer 1

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();