We work the dates out by hand every cycle and check them twice

Every contract carries its own machinery - due dates, notice windows, final dates - and somewhere in the office one person derives them all by hand, keeps them in a personal calendar, and gets asked are you sure? every month. Mostly they are. The month they aren't is priced in notified sums, because payment dates are not reminders; they are the dates rights turn on.

The calendar-and-tracker is the discipline in template form: each contract's dates derived once from its terms, laid out cycle by cycle, visible to the whole team rather than one person's diary, with what was served logged against each date. From there the routine stops being a memory test - and the tracking service exists for teams whose contract count has outgrown the spreadsheet.

If you would rather it were done for you, Notice & Deadline Tracking is the service that does it.