Week Numbers
ISO week numbers for 2028
See the week number for every date in 2028. ISO 8601 standard — weeks start on Monday, and week 1 contains the first Thursday of January.
| Week | Start Date | End Date | Month |
|---|---|---|---|
| 1 | Jan 3, 2028 | Jan 9, 2028 | January |
| 2 | Jan 10, 2028 | Jan 16, 2028 | January |
| 3 | Jan 17, 2028 | Jan 23, 2028 | January |
| 4 | Jan 24, 2028 | Jan 30, 2028 | January |
| 5 | Jan 31, 2028 | Feb 6, 2028 | February |
| 6 | Feb 7, 2028 | Feb 13, 2028 | February |
| 7 | Feb 14, 2028 | Feb 20, 2028 | February |
| 8 | Feb 21, 2028 | Feb 27, 2028 | February |
| 9 | Feb 28, 2028 | Mar 5, 2028 | March |
| 10 | Mar 6, 2028 | Mar 12, 2028 | March |
| 11 | Mar 13, 2028 | Mar 19, 2028 | March |
| 12 | Mar 20, 2028 | Mar 26, 2028 | March |
| 13 | Mar 27, 2028 | Apr 2, 2028 | April |
| 14 | Apr 3, 2028 | Apr 9, 2028 | April |
| 15 | Apr 10, 2028 | Apr 16, 2028 | April |
| 16 | Apr 17, 2028 | Apr 23, 2028 | April |
| 17 | Apr 24, 2028 | Apr 30, 2028 | April |
| 18 | May 1, 2028 | May 7, 2028 | May |
| 19 | May 8, 2028 | May 14, 2028 | May |
| 20 | May 15, 2028 | May 21, 2028 | May |
| 21 | May 22, 2028 | May 28, 2028 | May |
| 22 | May 29, 2028 | Jun 4, 2028 | June |
| 23 | Jun 5, 2028 | Jun 11, 2028 | June |
| 24 | Jun 12, 2028 | Jun 18, 2028 | June |
| 25 | Jun 19, 2028 | Jun 25, 2028 | June |
| 26 | Jun 26, 2028 | Jul 2, 2028 | July |
| 27 | Jul 3, 2028 | Jul 9, 2028 | July |
| 28 | Jul 10, 2028 | Jul 16, 2028 | July |
| 29 | Jul 17, 2028 | Jul 23, 2028 | July |
| 30 | Jul 24, 2028 | Jul 30, 2028 | July |
| 31 | Jul 31, 2028 | Aug 6, 2028 | August |
| 32 | Aug 7, 2028 | Aug 13, 2028 | August |
| 33 | Aug 14, 2028 | Aug 20, 2028 | August |
| 34 | Aug 21, 2028 | Aug 27, 2028 | August |
| 35 | Aug 28, 2028 | Sep 3, 2028 | September |
| 36 | Sep 4, 2028 | Sep 10, 2028 | September |
| 37 | Sep 11, 2028 | Sep 17, 2028 | September |
| 38 | Sep 18, 2028 | Sep 24, 2028 | September |
| 39 | Sep 25, 2028 | Oct 1, 2028 | October |
| 40 | Oct 2, 2028 | Oct 8, 2028 | October |
| 41 | Oct 9, 2028 | Oct 15, 2028 | October |
| 42 | Oct 16, 2028 | Oct 22, 2028 | October |
| 43 | Oct 23, 2028 | Oct 29, 2028 | October |
| 44 | Oct 30, 2028 | Nov 5, 2028 | November |
| 45 | Nov 6, 2028 | Nov 12, 2028 | November |
| 46 | Nov 13, 2028 | Nov 19, 2028 | November |
| 47 | Nov 20, 2028 | Nov 26, 2028 | November |
| 48 | Nov 27, 2028 | Dec 3, 2028 | December |
| 49 | Dec 4, 2028 | Dec 10, 2028 | December |
| 50 | Dec 11, 2028 | Dec 17, 2028 | December |
| 51 | Dec 18, 2028 | Dec 24, 2028 | December |
| 52 | Dec 25, 2028 | Dec 31, 2028 | December |
ISO 8601 defines week 1 as the week containing the first Thursday of January. Weeks start on Monday. A year has 52 weeks most years, or 53 weeks when January 1 falls on a Thursday (or Wednesday in a leap year).
Frequently asked questions
- What is ISO 8601 week numbering?
- ISO 8601 is an international standard for date and time formatting. Under this standard, weeks start on Monday, and week 1 is the week containing the first Thursday of January. This ensures each week belongs to exactly one year.
- Why does 2028 have 52 weeks?
- Most years have 52 ISO weeks. A year has 53 weeks when January 1 falls on a Thursday, or on a Wednesday in a leap year. This happens because the extra days push a partial week into a 53rd slot.
- How do I find the week number for a specific date?
- Use the Week Number Calculator to enter any date and get its ISO week number, ISO year and date range instantly.