How many days in December 2029?

31 days

December 2029 runs from Saturday the 1st to Monday the 31th.

Calendar grid for 12/2029, weeks starting Sun
ISO week	Sun	Mon	Tue	Wed	Thu	Fri	Sat
48	25	26	27	28	29	30	1
49	2Hanukkah	3	4Isra and Mi'raj	5	6	7	8
50	9	10	11	12	13	14	15
51	16	17	18	19	20	21Yule	22
52	23	24Christmas Eve	25Christmas Day	26	27	28	29
1	30	31New Year's Eve	1	2	3	4	5

About December 2029

December 2029 has 31 days, of which 21 are weekdays and 10 fall at the weekend. Taking out the 1 federal holiday leaves 20 working days.