For your easy reference, the following is a list of weeks and years with their corresponding date:
21 December 2014 – 4th Sunday of Advent Year B
22 December 2014 – 22 December – Season of Advent
23 December 2014 – 23 December – Season of Advent
24 December 2014 – Christmas Eve – Midnight Mass
25 December 2014 – Christmas Day – Mass During the Day
26 December 2014 – Dec 26 – Saint Stephen, the first Martyr – Feast