If 6th March, 2005 is Monday, what was the day of the week on 6th March, 2004?

Given

• 6 Mar 2005 is Monday.
• Find the day on 6 Mar 2004.

Key idea

• From a date in a leap year to the same date next year the weekday shifts by +1 (if the starting date is on/after Mar 1) and by +2 (if before Mar 1).
• Here we are moving back one year: 2005 → 2004.

Apply the rule

The interval 6 Mar 2004 → 6 Mar 2005 does not include Feb 29 (it occurs before Mar 6). Hence the forward shift is +1 day; reversing it is −1 day.So, 6 Mar 2004 = 6 Mar 2005 − 1 day = Monday − 1 = Sunday.

Final Answer
6 March 2004 was Sunday.