Oh man, this is hilarious.
Now i know how it happened. On 31 Dec i came back from patrol but spent a whole month in base so i went back out to sea on 31 Feb. Bloody hell! Embarassing ey? I lost a month! I was sorry for my crew that they'll spend New Years Eve at sea and it turned out they had their fun in the end. Got to take it easy on the rum myself!
P.s. Well, my avatar explains a lot....