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Dev: Add Zeller's Congruence utility class to calculate the day of the week (#6614)

* Add Zeller's Congruence utility class and unit tests

* fixed identified bugs

* fixed pmd failure
B
Banula Kumarage committed
61fbb1855cd403fe9ff1bff0caf1c7d9359fd612
Parent: 3c071c4
Committed by GitHub <noreply@github.com> on 10/9/2025, 6:36:20 PM