How to do date calculations ?

[Anon]

Hello,
I am trying to figure out how to do date calculations in PHP. For example, if I have a date such as '2001-09-01' how can I calculate the number of days since today ? I am looking for a solution using ONLY PHP, not using any database functions.

Thank you.

[jordan]

Use mktime() to convert the relevant dates to UNIX timestamps (seconds since Jan. 1, 1970) and then use simple addition or subtraction (or any of PHP's date/time functions - http://www.php.net/datetime) to figure out what you need.

[Anon]

Thank you