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Recipe: To know the day of the week of the other months of that year

Put the 369 ruler of this month to today.

  • Example
If today is May 31, 2019, the Wek mark is on 'F'.
This means a June 2019 Wek mark is on 'E♭', then June 30, 2019 is Saturday, for example.
  • next or previous year? noproblem

just step (a day) or leap (two days) the 369 ruler in in‐direction.