What was the day of the week on 4 July 2008?

​​Odd days in 2000 years: Since 2000 years is a complete 400-year cycle (which has 0 odd days),

the total odd days from the year 1 to 2000 is 0.

Calculate odd days from 2000 to 2007:

From 2000 to 2008, we have 7 years.

Count the leap years:
Leap years: 2000 (since 2000 is divisible by 4 and also divisible by 400).

So, we have 1 leap year (2000, 2004) and 6 normal years.

Odd days calculation:

1 leap year =  2 odd days

6 normal years = 6 odd days (1 odd day per normal year)

Total odd days from 2000 to 2008 = 2+ 6 = 8

1 Jan 2008 to 4 July 2008 = (3 + 1 +3 +2 + 3 +2 + 4)

= 18

Total odd days = 8 + 18 = 26 

26 ÷ 7 =  5 odd days 

So, 4 July 2008 was a Friday.