This isn't a big deal, I just wondered if I was the only one, or if I am reading it wrong or something. When waiting or looking in your pip-boy, it will tell you the date. For some reason my current date is 13/13/77. Which implies that there is a thirteenth month. Shouldn't it be in January now? I have learned plenty of Fallout lore, but never the addition of a 13th month lol.