Step 1: Determine if 2021 is a leap year.
2021 is not divisible by 4, classifying it as a common year with 365 days.
Step 2: Compute the number of weeks and remaining days within 365 days.
\[
365 \div 7 = 52 \text{ weeks } + 1 \text{ day}
\]
Step 3: Given that January 1st, 2021, was a Friday, January 1st, 2022, will be one day later.
\[
\text{Friday} + 1 \text{ day} = \text{Saturday}
\]
Consequently, January 1st, 2022, occurred on a Saturday.