Week Numbers 2028
2028 has 52 ISO weeks. Week 1 is the week with the year's first Thursday, and every week runs Monday to Sunday.
Below is the full list of 2028 week numbers with the exact Monday start date and Sunday end date for each week — plus a plain-language explainer of how ISO week numbering works and who uses it.
How 2028 numbers its weeks: 2028 starts on a Saturday, so ISO week 1 begins on Monday January 3, 2028. The year runs through week 52, which ends on December 31, 2028. Like most years, 2028 fits into the standard 52 weeks.
What Are ISO Week Numbers?
An ISO week number is a simple way to name a week with a number from 1 to 52 or 53, instead of a range of dates. Saying "week 32" is shorter than "the week of August 3" and means the same thing to anyone using the standard. The rules come from ISO 8601, an international date standard, so a week number means the same thing worldwide.
How week numbering works
Two rules cover almost everything:
- Weeks start on Monday and end on Sunday.
- Week 1 is the week that holds the year's first Thursday — the same as the week that contains January 4.
Because of that first-Thursday rule, the first few days of January can belong to the last week of the previous year, and the last days of December can belong to week 1 of the next year. That's normal, not a mistake.
Why 2028 has 52 weeks
Most years, including 2028, have 52 ISO weeks. A year only gets a 53rd week when it starts on a Thursday (or a Wednesday in a leap year). 2028 starts on a Saturday, so it has the usual 52.
Who uses week numbers?
- Payroll and finance — weekly and bi-weekly pay periods.
- Project and agile teams — sprints and delivery schedules often run by week number.
- Manufacturing and logistics — production and shipping plans use "CW" (calendar week) or "KW" in Europe.
- Schools and universities — term weeks and teaching schedules.
Tip: switch any of our monthly calendars to the Monday-start view and the week numbers appear right on the grid — handy for printing a wall calendar that shows them.
The Full 2028 Week Number Table
Every ISO week that touches 2028, with its Monday start and Sunday end. Weeks shown with another year in brackets belong to that year's numbering.
| Week | From (Monday) | To (Sunday) |
|---|---|---|
| W52 (2027) | December 27, 2027 | January 2, 2028 |
| W01 | January 3, 2028 | January 9, 2028 |
| W02 | January 10, 2028 | January 16, 2028 |
| W03 | January 17, 2028 | January 23, 2028 |
| W04 | January 24, 2028 | January 30, 2028 |
| W05 | January 31, 2028 | February 6, 2028 |
| W06 | February 7, 2028 | February 13, 2028 |
| W07 | February 14, 2028 | February 20, 2028 |
| W08 | February 21, 2028 | February 27, 2028 |
| W09 | February 28, 2028 | March 5, 2028 |
| W10 | March 6, 2028 | March 12, 2028 |
| W11 | March 13, 2028 | March 19, 2028 |
| W12 | March 20, 2028 | March 26, 2028 |
| W13 | March 27, 2028 | April 2, 2028 |
| W14 | April 3, 2028 | April 9, 2028 |
| W15 | April 10, 2028 | April 16, 2028 |
| W16 | April 17, 2028 | April 23, 2028 |
| W17 | April 24, 2028 | April 30, 2028 |
| W18 | May 1, 2028 | May 7, 2028 |
| W19 | May 8, 2028 | May 14, 2028 |
| W20 | May 15, 2028 | May 21, 2028 |
| W21 | May 22, 2028 | May 28, 2028 |
| W22 | May 29, 2028 | June 4, 2028 |
| W23 | June 5, 2028 | June 11, 2028 |
| W24 | June 12, 2028 | June 18, 2028 |
| W25 | June 19, 2028 | June 25, 2028 |
| W26 | June 26, 2028 | July 2, 2028 |
| W27 | July 3, 2028 | July 9, 2028 |
| W28 | July 10, 2028 | July 16, 2028 |
| W29 | July 17, 2028 | July 23, 2028 |
| W30 | July 24, 2028 | July 30, 2028 |
| W31 | July 31, 2028 | August 6, 2028 |
| W32 | August 7, 2028 | August 13, 2028 |
| W33 | August 14, 2028 | August 20, 2028 |
| W34 | August 21, 2028 | August 27, 2028 |
| W35 | August 28, 2028 | September 3, 2028 |
| W36 | September 4, 2028 | September 10, 2028 |
| W37 | September 11, 2028 | September 17, 2028 |
| W38 | September 18, 2028 | September 24, 2028 |
| W39 | September 25, 2028 | October 1, 2028 |
| W40 | October 2, 2028 | October 8, 2028 |
| W41 | October 9, 2028 | October 15, 2028 |
| W42 | October 16, 2028 | October 22, 2028 |
| W43 | October 23, 2028 | October 29, 2028 |
| W44 | October 30, 2028 | November 5, 2028 |
| W45 | November 6, 2028 | November 12, 2028 |
| W46 | November 13, 2028 | November 19, 2028 |
| W47 | November 20, 2028 | November 26, 2028 |
| W48 | November 27, 2028 | December 3, 2028 |
| W49 | December 4, 2028 | December 10, 2028 |
| W50 | December 11, 2028 | December 17, 2028 |
| W51 | December 18, 2028 | December 24, 2028 |
| W52 | December 25, 2028 | December 31, 2028 |