\nTo find the day of the week after a certain number of years, we need to calculate the number of “odd days” between the two dates. An odd day is the remainder when the total number of days is divided by 7.
\nA normal year (365 days) has 365 mod 7 = 1 odd day.
\nA leap year (366 days) has 366 mod 7 = 2 odd days.
\nThe period from 1st November 2019 to 1st November 2022 spans three full years: the period covering 2020, the period covering 2021, and the period covering 2022 up to Nov 1.
\n– From Nov 1, 2019 to Nov 1, 2020: This period includes the entire year 2020, which is a leap year (divisible by 4). Thus, this period adds 2 odd days.
\n– From Nov 1, 2020 to Nov 1, 2021: This period includes the entire year 2021, which is a normal year. Thus, this period adds 1 odd day.
\n– From Nov 1, 2021 to Nov 1, 2022: This period includes the entire year 2022, which is a normal year. Thus, this period adds 1 odd day.
\nTotal odd days from 1st November 2019 to 1st November 2022 = 2 (from 2020) + 1 (from 2021) + 1 (from 2022) = 4 odd days.
\nStarting from Friday, we move forward by 4 days:
\nFriday + 1 day = Saturday
\nSaturday + 1 day = Sunday
\nSunday + 1 day = Monday
\nMonday + 1 day = Tuesday
\nSo, 1st November 2022 is a Tuesday.
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