Week 51 of 2027
December 20 – December 26, 2027
| Monday | December 20, 2027 | Mon · week starts |
| Tuesday | December 21, 2027 | |
| Wednesday | December 22, 2027 | |
| Thursday | December 23, 2027 | |
| Friday | December 24, 2027 | |
| Saturday | December 25, 2027 | |
| Sunday | December 26, 2027 | Sun · week ends |
All weeks of 2027
2027 is an ISO year with 52 weeks.
About ISO week 51 of 2027
ISO 8601 weeks start on Monday and end on Sunday. Week 51 of 2027 begins on Monday, December 20, 2027 and ends on Sunday, December 26, 2027. Week numbering follows the international standard: week 1 of a year is the week containing the first Thursday of January, which is why some calendar dates near January 1st belong to the previous or next ISO year.
The ISO week system is the standard for business reporting across Europe and much of the world. The US convention differs: weeks start on Sunday and week 1 contains January 1st, so US week numbers can be one ahead of or behind ISO numbers near year boundaries.
Frequently asked questions
What dates are in week 51 of 2027?
Week 51 of 2027 spans December 20 – December 26, 2027: Monday December 20 through Sunday December 26.
When is week 51 of 2027?
Week 51 of 2027 starts in 419 days, on Monday, December 20, 2027.
Why does 2027 have 52 weeks?
2027 has the usual 52 ISO weeks. Only years starting on a Thursday (or a Wednesday in a leap year) get a 53rd week.