For your easy reference, the following is a list of weeks and years with their corresponding date:
26 April 2015 – 4th Sunday of Easter Year B
27 April 2015 – Monday of the 4th Week of Easter
28 April 2015 – Tuesday of the 4th Week of Easter
29 April 2015 – Wednesday of the 4th Week of Easter
30 April 2015 – Thursday of the 4th Week of Easter
1 May 2015 – Friday of the 4th Week of Easter
– Saint Joseph the Worker