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about subtract dates

mohamed abdo
Greenhorn

Joined: Aug 13, 2009
Posts: 8
how can i subtract two dates from each other,i need the result with the days count between them , (date - date = xxx day)
Maneesh Godbole
Saloon Keeper

Joined: Jul 26, 2007
Posts: 9994
    
    7

Moving to a more suitable forum.


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Maneesh Godbole
Saloon Keeper

Joined: Jul 26, 2007
Posts: 9994
    
    7

Check out Calendar#DAY_OF_YEAR and Calendar#get()
mohamed abdo
Greenhorn

Joined: Aug 13, 2009
Posts: 8
thank you sir , i found it
Rob Spoor
Sheriff

Joined: Oct 27, 2005
Posts: 19556
    
  16

That's the naive approach, which is broken because of daylight savings - there are two days a year that are not 24 hours.

The right approach indeed uses Calendar.get() in combination with both Calendar.DAY_OF_YEAR and Calendar.YEAR. In short:
- subtract the day of year of the first date from the day of year of the second date
- add the number of days for each year in difference as well; use Calendar.getActualMaximum(Calendar.DAY_OF_YEAR) to determine how many days a year has.

To make it easier, you can swap the operands if the first date is larger than the second:


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