For your easy reference, the following is a list of weeks and years with their corresponding date:
21 June 2015 – 12th Sunday in Ordinary Time Year B
22 June 2015 – Monday of Week 12 Year 1
23 June 2015 – Tuesday of Week 12 Year 1
24 June 2015 – Birthday of John the Baptist
25 June 2015 – Thursday of Week 12 Year 1
26 June 2015 – Friday of Week 12 Year 1