2029 has 52 ISO weeks.
Week 1 runs January 1 to January 7, and week 52 ends December 30. Weeks run Monday to Sunday, following ISO 8601.
- Weeks
- 52
- Week 1 starts
- January 1
- Week 52 ends
- December 30
- Standard
- ISO 8601
| Week | Starts (Monday) | Ends (Sunday) |
|---|---|---|
| 1 | ||
| 2 | ||
| 3 | ||
| 4 | ||
| 5 | ||
| 6 | ||
| 7 | ||
| 8 | ||
| 9 | ||
| 10 | ||
| 11 | ||
| 12 | ||
| 13 | ||
| 14 | ||
| 15 | ||
| 16 | ||
| 17 | ||
| 18 | ||
| 19 | ||
| 20 | ||
| 21 | ||
| 22 | ||
| 23 | ||
| 24 | ||
| 25 | ||
| 26 | ||
| 27 | ||
| 28 | ||
| 29 | ||
| 30 | ||
| 31 | ||
| 32 | ||
| 33 | ||
| 34 | ||
| 35 | ||
| 36 | ||
| 37 | ||
| 38 | ||
| 39 | ||
| 40 | ||
| 41 | ||
| 42 | ||
| 43 | ||
| 44 | ||
| 45 | ||
| 46 | ||
| 47 | ||
| 48 | ||
| 49 | ||
| 50 | ||
| 51 | ||
| 52 |
Why 2029 has 52 weeks
Under ISO 8601 a week belongs to the year that contains its Thursday. That gives every year either 52 or 53 whole weeks and never splits one across a year boundary. A year gets 53 when it starts on a Thursday, or on a Wednesday in a leap year.
ISO weeks versus US week numbering
The two conventions disagree. ISO weeks start on Monday, and week 1 is the week holding the first Thursday. The common North American convention starts weeks on Sunday and calls the week containing 1 January week 1, which can produce a short first week. Payroll, retail, and broadcast calendars often use the latter. If a week number here disagrees with one from another system, this is usually why.
Week numbers by month
Each month page shows the ISO weeks it spans:
- January2029
- February2029
- March2029
- April2029
- May2029
- June2029
- July2029
- August2029
- September2029
- October2029
- November2029
- December2029
Other years
- 2026 week numbers — 53 weeks
- 2027 week numbers — 52 weeks
- 2028 week numbers — 52 weeks
- 2030 week numbers — 52 weeks