For a mod I am working on I have been researching Tamriel calendars to try and work out which day of the week the Morrowind game starts on

Each week begins on a Sundas - this is consistent across the Daggerfall and Skyrim calendars

In Skyrim the day you start the game on is 17th Last Seed 4E 201 which is a Sundas

In Morrowind the papers you get in the Census Office are dated 16th Last Seed 427

Since the third era finishes circa 433 with the death of Martin Septim - there are at least 207 years (assuming there is no zero year and that the crisis was concluded in the same year as the player begins) I need to calculate back from the start date of Skyrim - it helps that both games start in Last Seed

Each year going back moves the start day of the month of Last Seed back one day since conveniently there are no leap years - so in 4E 201 the start of Last Seed is Fredas

By my calculations then in 3E 433 Sundas was the 1st day of Last Seed - 6 years back to 427 the 16th of Last Seed would be a Tirdas

My maths is a bit flaky at the best of times - however does this seem correct?