Rabbi Meir aus Worms - Reason for the Dates

"The writing on the tombstone doesn't quite match the date of 22 July 1540

If the Hebrew data is correct then the date should be about 1 August 1540 or it could be wrong Hebrew date and then it is a match to 22 July 1540"

The Gregorian date of 1 Aug 1540 translates to the Julian date of 22 Jul 1540. While we currently use the Gregorian calendar, they used the Julian calendar at that time.

https://stevemorse.org/jcal/julian.html