Been there and done that. I used to do 12 hour shifts, 7 days every 2 weeks, with a 2 on 2 off 3 on 2 off 2 on and 3 off pattern. My Fridays were Sunday, Tuesday and Thursday.
So glad I found an shift calendar app for my phone, as I have never been good with knowing what day of the week it is (and backpacking for a year completely wiped that out years ago!)
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