How can I perform arithmetic operation with dates in Java? [duplicate]

Question

Possible Duplicate:
How to calculate time difference in java?

Actually I want to subtract two dates in Java. I tried a lot but can't succeed. So anyone please help me.

Date dtStartDate=pCycMan.getStartDate();

Date dtEndDate=pCycMan.getEndDate();

How can I subtract these two Dates?

Answer 1

long msDiff = dtEndDate.getTime() - dtStartDate.getTime()

msDiff now holds the number of milliseconds difference between the two dates. Feel free to use the division and mod operators to convert to other units.

Answer 2

how can i subtract these two Dates?

You can get the difference in milliseconds like this:

dtEndDate.getTime() - dtStartDate.getTime()

(getTime returns the number of milliseconds since January 1, 1970, 00:00:00 GMT.)

However, for this type of date arithmetics the Joda time library, which has proper classes for time durations (Duration) is probably a better option.

Answer 3

To substract to dates you can get them both as longs getTime() and subtract the values that are returned.