Don’t take this the wrong way but I’m a little surprised you knew about the two “e”.

Yep, thx to the pronunciation. Sounds like "wensday". But, kinda YDI because you're supposed to learn how to spell the days of the week in 1st grade.

Did you really never notice when you looked at calendars?

If English isn't your first language I can understand somewhat, but if it is your native tongue, I gotta know how the hell you constantly made the same mistake for 20 years. Forget people not correcting you, it's basically impossible not to see it written down somewhere like a book, in schoolwork, a diary, and as ojoRojo mentioned, a calendar.