Could you please add a new standard (or at least optional) "Expire time"? At my company, the standard is for a password to expire 90 days after it is changed. The "3 months" option is close, but frequently misses the exact date. For example, a password I set today will expire on December 26, but the 3-month setting chooses December 27. Not an earth-shaking difference, but precision is usually better.
Maybe a new option could be "Expires in NN days", where you're prompted to enter the number of days?