Eris has given you a
clue. We've gotta figure out what this means.
Alright, let's start with the date. There have actually been a few February 30ths in history:
https://www.timeanddate.com/date/february-30.htmlSweden had a Feb 30th during a time when it was trying to switch calendars from Julian to Gregorian.
Some monk in the 13th century claimed that February had 30 days in leap years between 45 BCE and 8 BCE in the Julian calendar. There might be something there, but we'd also have to figure out which Gregorian dates those Feb 30ths correspond to.
The Soviet Union tried a "revolutionary calendar" in 1930-1931 which had a February 30th, and included a
5-day week. My intuition is that this is the next clue.