Java, Calculate the number of days between two dates [duplicate]

Possible Duplicate:
Calculating the Difference Between Two Java Date Instances

In Java, I want to calculate the number of days between two dates.

In my database they are stored as a DATE datatype, but in my code they are strings.

I want to calculate the no of days between those two strings.

Well to start with, you should only deal with them as strings when you have to. Most of the time you should work with them in a data type which actually describes the data you're working with.

I would recommend that you use Joda Time, which is a much better API than Date/Calendar. It sounds like you should use the LocalDate type in this case. You can then use:

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

Java 8 and later: ChronoUnit.between

Use instances of ChronoUnit to calculate amount of time in different units (days,months, seconds).

For Example:

ChronoUnit.DAYS.between(startDate,endDate)