In Philosopher's/Sorcerer's Stone, first chapter, Harry is brought to the Dursleys on a Tuesday. A few chapters later, when Hagrid is telling Harry the story of what happened to his parents, he says the attack (that we know happened the day before Harry was brought to the Dursley's) happened on Halloween night, the Halloween night when Harry was 1 year old (which would be his second Halloween). The only Halloween that fell on a Monday in the time frame we're talking about was in 1983, meaning Harry was born in July of 1982. Since J.K. Rowling said in an interview that Snape was about 35 or 36. Okay, so 1982+11 (Harry's age) = 1993, the setting of P/SS. If Snape (and the Marauders) was 36 years old, they graduated from Hogwarts in 1974. James and Lily got married sometime between 1974 and around the middle of 1981.
I'm a moron...
