Given Data

1. Given reference date: 1st January 2021 was a Friday.

Question

What day of the week was 1st January 2022?

Answer

Saturday.

Solution

1. Determine the type of year for 2021: 2021 is an ordinary year (365 days).
2. An ordinary year has 52 weeks and 1 odd day.
3. To find the day on the same date in the next year, advance by the number of odd days.
4. Day on 1st Jan 2022 = Friday + 1 odd day = Saturday.
5. Therefore, 1st January 2022 was a Saturday.