This is a Smarty Function file that can be installed into your plugins for smarty to provide the capability of calculating the time between two dates in either minutes, days, weeks, and years.

Input
- date1 = "mm/dd/yyyy" or "yyyy/mm/dd" or "yyyy-mm-dd"
- date2 = "mm/dd/yyyy" or "yyyy/mm/dd" or "yyyy-mm-dd" or $smarty.now
- assign = name of variable to assign difference to
- interval = "days" (default), "weeks", "years"

Examples
- {date_diff date1="5/12/2003" date2=$smarty.now interval="weeks"}
- {date_diff date1="5/12/2003" date2="5/10/2008" assign="diff"}{$diff}