Week numbers 2028
All 52 ISO weeks of 2028 with their exact dates. 2028 starts on a Saturday, has 366 days, and counts 52 calendar weeks. Week 1 begins Jan 3, 2028; week 52 ends Dec 31, 2028.
2028 has 52 ISO weeks. Week 1: Jan 3 – Jan 9, 2028. Week 52: Dec 25 – Dec 31, 2028.
Week number chart 2028
| Week number | From (Monday) | To (Sunday) | Month | Quarter |
|---|---|---|---|---|
| Week 1 | Jan 3 | Jan 9 | January | Q1 |
| Week 2 | Jan 10 | Jan 16 | January | Q1 |
| Week 3 | Jan 17 | Jan 23 | January | Q1 |
| Week 4 | Jan 24 | Jan 30 | January | Q1 |
| Week 5 | Jan 31 | Feb 6 | Jan / Feb | Q1 |
| Week 6 | Feb 7 | Feb 13 | February | Q1 |
| Week 7 | Feb 14 | Feb 20 | February | Q1 |
| Week 8 | Feb 21 | Feb 27 | February | Q1 |
| Week 9 | Feb 28 | Mar 5 | Feb / Mar | Q1 |
| Week 10 | Mar 6 | Mar 12 | March | Q1 |
| Week 11 | Mar 13 | Mar 19 | March | Q1 |
| Week 12 | Mar 20 | Mar 26 | March | Q1 |
| Week 13 | Mar 27 | Apr 2 | Mar / Apr | Q1 |
| Week 14 | Apr 3 | Apr 9 | April | Q2 |
| Week 15 | Apr 10 | Apr 16 | April | Q2 |
| Week 16 | Apr 17 | Apr 23 | April | Q2 |
| Week 17 | Apr 24 | Apr 30 | April | Q2 |
| Week 18 | May 1 | May 7 | May | Q2 |
| Week 19 | May 8 | May 14 | May | Q2 |
| Week 20 | May 15 | May 21 | May | Q2 |
| Week 21 | May 22 | May 28 | May | Q2 |
| Week 22 | May 29 | Jun 4 | May / Jun | Q2 |
| Week 23 | Jun 5 | Jun 11 | June | Q2 |
| Week 24 | Jun 12 | Jun 18 | June | Q2 |
| Week 25 | Jun 19 | Jun 25 | June | Q2 |
| Week 26 | Jun 26 | Jul 2 | Jun / Jul | Q2 |
| Week 27 | Jul 3 | Jul 9 | July | Q3 |
| Week 28 | Jul 10 | Jul 16 | July | Q3 |
| Week 29 | Jul 17 | Jul 23 | July | Q3 |
| Week 30 | Jul 24 | Jul 30 | July | Q3 |
| Week 31 | Jul 31 | Aug 6 | Jul / Aug | Q3 |
| Week 32 | Aug 7 | Aug 13 | August | Q3 |
| Week 33 | Aug 14 | Aug 20 | August | Q3 |
| Week 34 | Aug 21 | Aug 27 | August | Q3 |
| Week 35 | Aug 28 | Sep 3 | Aug / Sep | Q3 |
| Week 36 | Sep 4 | Sep 10 | September | Q3 |
| Week 37 | Sep 11 | Sep 17 | September | Q3 |
| Week 38 | Sep 18 | Sep 24 | September | Q3 |
| Week 39 | Sep 25 | Oct 1 | Sep / Oct | Q3 |
| Week 40 | Oct 2 | Oct 8 | October | Q4 |
| Week 41 | Oct 9 | Oct 15 | October | Q4 |
| Week 42 | Oct 16 | Oct 22 | October | Q4 |
| Week 43 | Oct 23 | Oct 29 | October | Q4 |
| Week 44 | Oct 30 | Nov 5 | Oct / Nov | Q4 |
| Week 45 | Nov 6 | Nov 12 | November | Q4 |
| Week 46 | Nov 13 | Nov 19 | November | Q4 |
| Week 47 | Nov 20 | Nov 26 | November | Q4 |
| Week 48 | Nov 27 | Dec 3 | Nov / Dec | Q4 |
| Week 49 | Dec 4 | Dec 10 | December | Q4 |
| Week 50 | Dec 11 | Dec 17 | December | Q4 |
| Week 51 | Dec 18 | Dec 24 | December | Q4 |
| Week 52 | Dec 25 | Dec 31 | December | Q4 |
Weeks follow ISO 8601 (Monday start, week 1 contains January 4).
2028 week numbers by month
Which ISO weeks fall in each month of 2028, and how many weeks start (on a Monday) in that month.
| Month | Week numbers | Weeks starting | Month starts |
|---|---|---|---|
| January | 52 (2027), 1–5 | 5 | Jan 1 (Sat) |
| February | 5–9 | 4 | Feb 1 (Tue) |
| March | 9–13 | 4 | Mar 1 (Wed) |
| April | 13–17 | 4 | Apr 1 (Sat) |
| May | 18–22 | 5 | May 1 (Mon) |
| June | 22–26 | 4 | Jun 1 (Thu) |
| July | 26–31 | 5 | Jul 1 (Sat) |
| August | 31–35 | 4 | Aug 1 (Tue) |
| September | 35–39 | 4 | Sep 1 (Fri) |
| October | 39–44 | 5 | Oct 1 (Sun) |
| November | 44–48 | 4 | Nov 1 (Wed) |
| December | 48–52 | 4 | Dec 1 (Fri) |
Holidays and key dates 2028 by week number
| Date | Day | ISO week | US week |
|---|---|---|---|
| New Year's Day | Saturday, Jan 1, 2028 | Week 52 (2027) | Week 1 |
| Valentine's Day | Monday, Feb 14, 2028 | Week 7 | Week 8 |
| Easter Sunday | Sunday, Apr 16, 2028 | Week 15 | Week 17 |
| Mother's Day (US) | Sunday, May 14, 2028 | Week 19 | Week 21 |
| Memorial Day (US) | Monday, May 29, 2028 | Week 22 | Week 23 |
| Father's Day (US) | Sunday, Jun 18, 2028 | Week 24 | Week 26 |
| Independence Day (US) | Tuesday, Jul 4, 2028 | Week 27 | Week 28 |
| Labor Day (US) | Monday, Sep 4, 2028 | Week 36 | Week 37 |
| Halloween | Tuesday, Oct 31, 2028 | Week 44 | Week 45 |
| Thanksgiving (US) | Thursday, Nov 23, 2028 | Week 47 | Week 48 |
| Black Friday | Friday, Nov 24, 2028 | Week 47 | Week 48 |
| Christmas Day | Monday, Dec 25, 2028 | Week 52 | Week 53 |
| New Year's Eve | Sunday, Dec 31, 2028 | Week 52 | Week 54 |
US (Sunday-start) week numbers in 2028
The chart above uses ISO 8601 (Monday start). US calendars, Outlook in US locale and Excel's default
WEEKNUM() count differently: weeks start on Sunday and week 1 is the week containing
January 1. In 2028, US week 1 runs from Sunday, Dec 26, 2027 to Saturday, Jan 1, 2028,
and the year has 54 US week numbers (the last one is partial).
For Monday–Saturday the US week number is 1 higher than the ISO week number (so ISO week 26 is US week 27); on Sundays it is 2 higher. To convert any single date, use the week number calculator — it shows both systems. Background: week start conventions.
Other years
Frequently asked questions
How many weeks does 2028 have?
2028 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 2028 start?
Week 1 of 2028 runs from Monday, Jan 3, 2028 to Sunday, Jan 9, 2028 — it is the week containing January 4. 2028 itself begins on a Saturday.
When does the last week of 2028 end?
Week 52, the final week of 2028, runs from Dec 25, 2028 to Dec 31, 2028.
Is 2028 a leap year?
Yes — 2028 has 366 days, which is 52 weeks and 2 days.
What week number is Christmas 2028?
Christmas Day 2028 (Monday, Dec 25, 2028) is in ISO week 52 and US week 53. Thanksgiving (Nov 23, 2028) is in ISO week 47, and July 4 is in ISO week 27.
Do US week numbers differ from ISO week numbers in 2028?
Yes: from Monday to Saturday the US (Sunday-start) week number is 1 higher than the ISO week number in 2028, and 2 higher on Sundays.