An organisation I'm working with wants to edit a membership type to change it from annual rolling to annual fixed. When I set the fixed option CiviCRM appears to require a rollover date (if I don't set a date for this field CiviCRM flags it up and won't save my changes). But we don't want a rollover at all. Instead we are offering reduced fees based on when in the year the new member signs up.
There doesn't seem to be any option to not have a rollover date. The start date for the membership is Jan 01. If I set the rollover date as Dec 31, then I'm concerned that someone signing up on Dec 31 2015 will get low price and get a membership lasting 1 day, plus the rollover year, with and end date of Dec 31 2016. Any other date I could set would simply extend this rollover window.