Week numbers 2027
All 52 ISO weeks of 2027 with their exact dates. 2027 starts on a Friday, has 365 days, and counts 52 calendar weeks. Week 1 begins Jan 4, 2027; week 52 ends Jan 2, 2028.
2027 has 52 ISO weeks. Week 1: Jan 4 – Jan 10, 2027. Week 52: Dec 27 – Jan 2, 2028.
Week number chart 2027
| Week number | From (Monday) | To (Sunday) | Month | Quarter |
|---|---|---|---|---|
| Week 1 | Jan 4 | Jan 10 | January | Q1 |
| Week 2 | Jan 11 | Jan 17 | January | Q1 |
| Week 3 | Jan 18 | Jan 24 | January | Q1 |
| Week 4 | Jan 25 | Jan 31 | January | Q1 |
| Week 5 | Feb 1 | Feb 7 | February | Q1 |
| Week 6 | Feb 8 | Feb 14 | February | Q1 |
| Week 7 | Feb 15 | Feb 21 | February | Q1 |
| Week 8 | Feb 22 | Feb 28 | February | Q1 |
| Week 9 | Mar 1 | Mar 7 | March | Q1 |
| Week 10 | Mar 8 | Mar 14 | March | Q1 |
| Week 11 | Mar 15 | Mar 21 | March | Q1 |
| Week 12 | Mar 22 | Mar 28 | March | Q1 |
| Week 13 | Mar 29 | Apr 4 | Mar / Apr | Q2 |
| Week 14 | Apr 5 | Apr 11 | April | Q2 |
| Week 15 | Apr 12 | Apr 18 | April | Q2 |
| Week 16 | Apr 19 | Apr 25 | April | Q2 |
| Week 17 | Apr 26 | May 2 | Apr / May | Q2 |
| Week 18 | May 3 | May 9 | May | Q2 |
| Week 19 | May 10 | May 16 | May | Q2 |
| Week 20 | May 17 | May 23 | May | Q2 |
| Week 21 | May 24 | May 30 | May | Q2 |
| Week 22 | May 31 | Jun 6 | May / Jun | Q2 |
| Week 23 | Jun 7 | Jun 13 | June | Q2 |
| Week 24 | Jun 14 | Jun 20 | June | Q2 |
| Week 25 | Jun 21 | Jun 27 | June | Q2 |
| Week 26 | Jun 28 | Jul 4 | Jun / Jul | Q3 |
| Week 27 | Jul 5 | Jul 11 | July | Q3 |
| Week 28 | Jul 12 | Jul 18 | July | Q3 |
| Week 29 | Jul 19 | Jul 25 | July | Q3 |
| Week 30 | Jul 26 | Aug 1 | Jul / Aug | Q3 |
| Week 31 | Aug 2 | Aug 8 | August | Q3 |
| Week 32 | Aug 9 | Aug 15 | August | Q3 |
| Week 33 | Aug 16 | Aug 22 | August | Q3 |
| Week 34 | Aug 23 | Aug 29 | August | Q3 |
| Week 35 | Aug 30 | Sep 5 | Aug / Sep | Q3 |
| Week 36 | Sep 6 | Sep 12 | September | Q3 |
| Week 37 | Sep 13 | Sep 19 | September | Q3 |
| Week 38 | Sep 20 | Sep 26 | September | Q3 |
| Week 39 | Sep 27 | Oct 3 | Sep / Oct | Q3 |
| Week 40 | Oct 4 | Oct 10 | October | Q4 |
| Week 41 | Oct 11 | Oct 17 | October | Q4 |
| Week 42 | Oct 18 | Oct 24 | October | Q4 |
| Week 43 | Oct 25 | Oct 31 | October | Q4 |
| Week 44 | Nov 1 | Nov 7 | November | Q4 |
| Week 45 | Nov 8 | Nov 14 | November | Q4 |
| Week 46 | Nov 15 | Nov 21 | November | Q4 |
| Week 47 | Nov 22 | Nov 28 | November | Q4 |
| Week 48 | Nov 29 | Dec 5 | Nov / Dec | Q4 |
| Week 49 | Dec 6 | Dec 12 | December | Q4 |
| Week 50 | Dec 13 | Dec 19 | December | Q4 |
| Week 51 | Dec 20 | Dec 26 | December | Q4 |
| Week 52 | Dec 27 | Jan 2, 2028 | Dec / Jan | Q4 |
The final week, week 52, runs into 2028: it ends on Jan 2, 2028. Weeks follow ISO 8601 (Monday start, week 1 contains January 4).
Other years
Frequently asked questions
How many weeks does 2027 have?
2027 has 52 ISO weeks. Like most years it has 52 numbered weeks; the nearest 53-week years are 2026, 2032.
When does week 1 of 2027 start?
Week 1 of 2027 runs from Monday, Jan 4, 2027 to Sunday, Jan 10, 2027 — it is the week containing January 4. 2027 itself begins on a Friday.
When does the last week of 2027 end?
Week 52, the final week of 2027, runs from Dec 27, 2027 to Jan 2, 2028.
Is 2027 a leap year?
No — 2027 has 365 days, which is 52 weeks and 1 day.