For your easy reference, the following is a list of weeks and years with their corresponding date:
18 Dec 2016 – 4th Sunday of Advent Year A
19 Dec 2016 – 19 December – Season of Advent
20 Dec 2016 – 20 December – Season of Advent
21 Dec 2016 – 21 December – Season of Advent
22 Dec 2016 – 22 December – Season of Advent
23 Dec 2016 – 23 December – Season of Advent