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In 1996, Patek Philippe patented the annual calendar function. In 2006, the Patek Philippe Annual Calendar reference 5396 was introduced.The annual calendar function requires one adjustment per year. Namely, at the end of February as it only recognizes 30- and 31-day months. This function stands between a normal full calendar (only recognizes 31-day months) and the perpetual calendar (recognizes 28-, 30- and 31-day months and leap years).The 5396 is slightly more simple, and maybe even cooler, than a perpetual calendar. The dial displays, next to the hours, minutes and seconds, the day of the week and the month below the 12-hour position. At the 6-hour position it displays the date and above this, the moonphase encircled by a 24-hour display. The dial of this 18k whitegold watch is well proportioned because of the quiet, blue display. The dauphine hands really top it off. The watch comes on an 18k whitegold, Patek Philippe bracelet and dates back to 2012. The sapphire crystal caseback displays a marvelous work of art: Patek Philippe's caliber 324 QA LU 24H. In order to set all functions right, you first need to put the watch at 06:00 PM. After that, use the Patek Philippe tool to push the buttons on the sides of the case. Start with the upper-left one and work clockwise to set all functions.Fun fact: It's absolutely normal that, when the clock hits 12:00 AM, it approximately takes an hour for the date to change.