How many weeks are in 2030?
2030 has 52 weeks in ISO 8601, because it starts on a Tuesday. In the US system, where week 1 is the week of January 1 and partial weeks count, 2030 runs from week 1 to week 53. The last US week starts on Sunday, Dec 29, 2030.
ISO week 1 starts early, on Monday, Dec 31, 2029, because the week that holds January 1 also holds the first Thursday of 2030. At the other end, the days from Dec 30, 2030 on are already ISO week 1 of 2031.
US week 1 runs from Dec 30, 2029 to Jan 5, 2030. Because US weeks start on Sunday and ISO weeks on Monday, the same number never covers exactly the same days. For most of 2030, a date has the same number in both systems from Monday to Saturday, and the US number is one higher on Sundays.
Weeks month by month
January: US weeks 1 to 5; February: US weeks 5 to 9; March: US weeks 9 to 14; April: US weeks 14 to 18; May: US weeks 18 to 22; June: US weeks 22 to 27; July: US weeks 27 to 31; August: US weeks 31 to 35; September: US weeks 36 to 40; October: US weeks 40 to 44; November: US weeks 44 to 48; December: US weeks 49 to 53. In ISO numbering, January 2030 starts in week 1 and December ends in week 1 (of 2031).
2030 week numbers with dates
| Week | US (Sunday to Saturday) | ISO 8601 (Monday to Sunday) |
|---|---|---|
| 1 | Dec 30, 2029 to Jan 5 | Dec 31, 2029 to Jan 6 |
| 2 | Jan 6 to Jan 12 | Jan 7 to Jan 13 |
| 3 | Jan 13 to Jan 19 | Jan 14 to Jan 20 |
| 4 | Jan 20 to Jan 26 | Jan 21 to Jan 27 |
| 5 | Jan 27 to Feb 2 | Jan 28 to Feb 3 |
| 6 | Feb 3 to Feb 9 | Feb 4 to Feb 10 |
| 7 | Feb 10 to Feb 16 | Feb 11 to Feb 17 |
| 8 | Feb 17 to Feb 23 | Feb 18 to Feb 24 |
| 9 | Feb 24 to Mar 2 | Feb 25 to Mar 3 |
| 10 | Mar 3 to Mar 9 | Mar 4 to Mar 10 |
| 11 | Mar 10 to Mar 16 | Mar 11 to Mar 17 |
| 12 | Mar 17 to Mar 23 | Mar 18 to Mar 24 |
| 13 | Mar 24 to Mar 30 | Mar 25 to Mar 31 |
| 14 | Mar 31 to Apr 6 | Apr 1 to Apr 7 |
| 15 | Apr 7 to Apr 13 | Apr 8 to Apr 14 |
| 16 | Apr 14 to Apr 20 | Apr 15 to Apr 21 |
| 17 | Apr 21 to Apr 27 | Apr 22 to Apr 28 |
| 18 | Apr 28 to May 4 | Apr 29 to May 5 |
| 19 | May 5 to May 11 | May 6 to May 12 |
| 20 | May 12 to May 18 | May 13 to May 19 |
| 21 | May 19 to May 25 | May 20 to May 26 |
| 22 | May 26 to Jun 1 | May 27 to Jun 2 |
| 23 | Jun 2 to Jun 8 | Jun 3 to Jun 9 |
| 24 | Jun 9 to Jun 15 | Jun 10 to Jun 16 |
| 25 | Jun 16 to Jun 22 | Jun 17 to Jun 23 |
| 26 | Jun 23 to Jun 29 | Jun 24 to Jun 30 |
| 27 | Jun 30 to Jul 6 | Jul 1 to Jul 7 |
| 28 | Jul 7 to Jul 13 | Jul 8 to Jul 14 |
| 29 | Jul 14 to Jul 20 | Jul 15 to Jul 21 |
| 30 | Jul 21 to Jul 27 | Jul 22 to Jul 28 |
| 31 | Jul 28 to Aug 3 | Jul 29 to Aug 4 |
| 32 | Aug 4 to Aug 10 | Aug 5 to Aug 11 |
| 33 | Aug 11 to Aug 17 | Aug 12 to Aug 18 |
| 34 | Aug 18 to Aug 24 | Aug 19 to Aug 25 |
| 35 | Aug 25 to Aug 31 | Aug 26 to Sep 1 |
| 36 | Sep 1 to Sep 7 | Sep 2 to Sep 8 |
| 37 | Sep 8 to Sep 14 | Sep 9 to Sep 15 |
| 38 | Sep 15 to Sep 21 | Sep 16 to Sep 22 |
| 39 | Sep 22 to Sep 28 | Sep 23 to Sep 29 |
| 40 | Sep 29 to Oct 5 | Sep 30 to Oct 6 |
| 41 | Oct 6 to Oct 12 | Oct 7 to Oct 13 |
| 42 | Oct 13 to Oct 19 | Oct 14 to Oct 20 |
| 43 | Oct 20 to Oct 26 | Oct 21 to Oct 27 |
| 44 | Oct 27 to Nov 2 | Oct 28 to Nov 3 |
| 45 | Nov 3 to Nov 9 | Nov 4 to Nov 10 |
| 46 | Nov 10 to Nov 16 | Nov 11 to Nov 17 |
| 47 | Nov 17 to Nov 23 | Nov 18 to Nov 24 |
| 48 | Nov 24 to Nov 30 | Nov 25 to Dec 1 |
| 49 | Dec 1 to Dec 7 | Dec 2 to Dec 8 |
| 50 | Dec 8 to Dec 14 | Dec 9 to Dec 15 |
| 51 | Dec 15 to Dec 21 | Dec 16 to Dec 22 |
| 52 | Dec 22 to Dec 28 | Dec 23 to Dec 29 |
| 53 | Dec 29 to Jan 4, 2031 | No ISO week 53 |
Holidays by week number in 2030
Federal holidays and Easter, with their week in each system. 1 of these 12 dates have a different number in the two systems, so say which one you mean when you plan around them. None of the federal holidays falls on a weekend this year.
| Holiday | Date | US week | ISO week |
|---|---|---|---|
| New Year’s Day | Tue, Jan 1 | 1 | 1 |
| Martin Luther King Jr. Day | Mon, Jan 21 | 4 | 4 |
| Presidents’ Day | Mon, Feb 18 | 8 | 8 |
| Easter Sunday | Sun, Apr 21 | 17 | 16 |
| Memorial Day | Mon, May 27 | 22 | 22 |
| Juneteenth | Wed, Jun 19 | 25 | 25 |
| Independence Day | Thu, Jul 4 | 27 | 27 |
| Labor Day | Mon, Sep 2 | 36 | 36 |
| Columbus Day | Mon, Oct 14 | 42 | 42 |
| Veterans Day | Mon, Nov 11 | 46 | 46 |
| Thanksgiving | Thu, Nov 28 | 48 | 48 |
| Christmas Day | Wed, Dec 25 | 52 | 52 |
Writing a date as an ISO week date
ISO 8601 can also write a date as year, week and weekday. Thanksgiving 2030, Nov 28, 2030, becomes 2030-W48-4: week 48, day 4 (Thursday). Christmas Day becomes 2030-W52-3. Planning tools and some spreadsheets accept this form directly.
Other years: week numbers 2029. For any single date, the week number tool gives the week in one tap, and the day of the week calculator tells you which weekday it falls on.