I was reading this below and I had a question: Link
Take a look under "The Key Value Method" where it says "A remainder of 0 corresponds to Saturday, 1 means sunday, etc."
My Question:
It’s rough to start a week on Saturday. What adjustments would be necessary to have a remainder of 0 associated with Sunday? (This might allow a mnemonic of Nun-day, One-day, Twos-day, Wednesday, Fours-day, Fives-day, Saturday.)
First of all, in the original post, 0 is for Saturday, assume that it is an error on your part in writing.
Now to get 0 for Sunday, all you do is to subtract 1 (mod 7) to all the key values. So if Jan is 1, it becomes 0 and if Dec is 6 it becomes 5 and if Apr is 0 it becomes 6. All other logic remains the same.