December 2026
Plan with intention
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Made with Calendar Forge
Date guide
Monday, December 21, 2026
Monday, December 21, 2026 falls on a Monday. It is day 355 of 365 and sits in ISO week 52.
Monday21
December 2026
139 days from today (UTC)Day of year355 of 365
ISO week52
QuarterQ4
Days left in year10
Leap yearNo
ISO date2026-12-21
In context
December 2026 calendar
The selected date is highlighted. US national holidays are shown when they occur.
December 21 written four ways
- ISO 8601
- 2026-12-21
- US numeric
- 12/21/2026
- International
- 21/12/2026
- Long form
- Monday, December 21, 2026
No national holiday listed
Calendar Forge does not list a US or Canadian national holiday on this date. Regional holidays and informal observances may still apply.
Printable daily planner
Monday · Week 52Plan Dec 21, 2026
Schedule
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