For your easy reference, the following is a list of weeks and years with their corresponding date:
13 Dec 2015 – 3rd Sunday of Advent Year C
14 Dec 2015 – Monday of the 3rd Week of Advent
15 Dec 2015 – Tuesday of the 3rd Week of Advent
16 Dec 2015 – Wednesday of the 3rd Week of Advent
17 Dec 2015 – 17 December – Season of Advent
18 Dec 2015 – 18 December – Season of Advent