I don't fill anything in my new diary - I got my 2013 diary way back in August, so I could start making work appointments for this year already. We have a separate permanent birthday book so we don't have to put them in our diaries. The calendar in the kitchen has both of our appointments etc on it, and when things are due.
31st March is going to be interesting - that's the day we're due to be made redundant, but the last working day is Thursday 28th March.