Is it ridiculous that I still need a military time conversion chart printed above my desk?

Time it Right
13:00 1:00    PM
14:00 2:00    PM
15:00 3:00    PM
16:00 4:00    PM
17:00 5:00    PM
18:00 6:00    PM
19:00 7:00    PM
20:00 8:00    PM
21:00 9:00    PM
22:00 10:00  PM
23:00 11:00  PM