january 1, 2007 was monday. what day of the week lies on jan. 1, 2008?

January 1, 2007 was a Monday. Since 2007 was a common year with 365 days, it has 1 odd day (365 ÷ 7 = 52 weeks + 1 day). Therefore, January 1, 2008 falls one day after Monday, which is Tuesday

. So, January 1, 2008 was a Tuesday.