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Part of 2017 Ecuador NMO (OMEC)

Problems(1)

what day of week day was June 6, 1944 ? 2017 Ecuador NMO (OMEC) 3.1

Source:

9/18/2021
Determine what day of the week day was: June 66, 19441944.
Note: Leap years are those that are multiples of 44 and do not end in 0000 or that are multiples of 400400, for example 18121812, 18161816, 18201820, 16001600, 20002000, but 18001800, 18101810, 21002100 are not leaps.
Giving the answer without any mathematical justification will not award points.
number theory