Prorate Benefits Premiums?

Indiana University is seeking feedback on how (or if) other institutions prorate benefit deductions on a hire and termination?

For example:

A monthly paid employee with a pay period of the 1^st of the month and the last day of the month enrolls in or terminates from benefits somewhere in the middle of the month.

• Do you manually calculate a prorated amount?
• Do you take the whole premium regardless of the date?
• Do you setup deduction begin and end date rules to something other than coverage elect date?  If so, what are your date rules?

Any information you can provide is appreciated.