Ding ding ding! The biggest thing to note assuming you just knew leap years is that after February in 1900 the days advanced by 1 so January is the only possibility
Okay. Heres some help:
There are 365 days in each non-Leap Year.
There are 366 days in each Leap Year.
Leap Years occur every four years except in years that are divisible by 100, and except-except in years that are divisible by 400.
Thus, 1900 is the only year in the 20th century that is...