If 3rd December 2000 was Sunday, then what was the day of 3rd January 2001?

If 1st January, 2001 was Monday, then what day of the week was it on 31st December, 2001?

It was Sunday on January 1, 2006. What was the day of the week on January 1, 2010?

It was Sunday on Jan 1, 2006. What was the day of the week on Jan 1, 2010?

If October 10, 2023 was a Tuesday, then what day of the week was December 23, 2023?

If 1st January, 2024 was a Monday, then which day of the week was 1st January, 2025?