How many days in December 2028?

31 days

December 2028 runs from Friday the 1st to Sunday the 31th.

Calendar grid for 12/2028, weeks starting Sun
ISO week	Sun	Mon	Tue	Wed	Thu	Fri	Sat
48	26	27	28	29	30	1	2
49	3Advent Sunday	4	5	6	7	8	9
50	10	11	12	13Hanukkah	14Isra and Mi'raj	15	16
51	17	18	19	20	21Yule	22	23
52	24Christmas Eve	25Christmas Day	26	27	28	29	30
1	31New Year's Eve	1	2	3	4	5	6

About December 2028

December 2028 has 31 days, of which 21 are weekdays and 10 fall at the weekend. Taking out the 1 federal holiday leaves 20 working days.