On what dates of April, 2001 did Wednesday fall?

1^st, 8^th, 15^th, 22^nd, 29^th

2^nd, 9^th, 16^th, 23^rd, 30^th

3^rd, 10^th, 17^th, 24^th

4^th, 11^th, 18^th, 25^th

Explanation:

1^st April, 2001 =2000 years + Period from 1.1.2001 to 1.4.2001

Odd days in 1600 years = 0

Odd days in 400 years = 0

Jan. Feb. March April
(31 + 28 + 31 + 1) = 91 days $\equiv$ 0 odd days.

Total number of odd days = (0 + 0 + 0) = 0

On 1^st April, 2001 it was Sunday.

In April, 2001 Wednesday falls on 4^th, 11^th, 18^th and 25^th.