Q: I read that the best day to retire under the Civil Service Retirement System at the end of leave year 2013 is Dec. 28, which confuses me because we’re always told to retire the end of the month or within the first three days of the month. I know the Dec. 28 is the end of a pay period, but wouldn’t it work out just as well if I retired on Jan. 2 or 3 since I’d get paid for the holiday of Jan. 1? A: You can retire on any day that suits you. However, keep these facts…