Monday, November 2, 2026
- Input
- 2026-11-02
- Expected output
- ISO 2026-W45 | US 2026-W45
Both systems agree.
Carregando ferramenta… / Loading tool…
what week number is it today
The tool reads your device clock and shows today's week in large type, with its date range, in ISO 8601 and the US system. If the number in your planner, spreadsheet or a website is different, it is almost always the counting system, not a mistake.
Both systems agree.
Sunday: ISO closes the week, the US opens it.
Thursday: last ISO week of 2026, first US week of 2027.
Friday: still 2026 in ISO.
Monday: opens ISO week 1 and is already week 2 in the US.
The big number at the top shows today's week, calculated from your device's date. On Monday, November 2, 2026, it is week 45 in both ISO 8601 and the US system; on the Sunday before, November 1, the systems differ (44 in ISO, 45 in the US).
In ISO, find the Thursday of your week, see which day of the year it is, subtract 1, divide by 7, round down and add 1. It is the same calculation the tool runs behind the big number.
Each program picks a system, and some let the user switch. Checking whether the program uses ISO weeks or Sunday-start weeks resolves almost every off-by-one case.
Yes, the page checks the clock every 30 seconds and updates the number and dates when your time zone's day turns over, with no reload.
Reading today's date...
52 weeks, from the first (starts 01/04/2027) to the last (ends 01/02/2028).
| Week | Start | End |
|---|---|---|
| 1 | Mon 01/04/2027 | Sun 01/10/2027 |
| 2 | Mon 01/11/2027 | Sun 01/17/2027 |
| 3 | Mon 01/18/2027 | Sun 01/24/2027 |
| 4 | Mon 01/25/2027 | Sun 01/31/2027 |
| 5 | Mon 02/01/2027 | Sun 02/07/2027 |
| 6 | Mon 02/08/2027 | Sun 02/14/2027 |
| 7 | Mon 02/15/2027 | Sun 02/21/2027 |
| 8 | Mon 02/22/2027 | Sun 02/28/2027 |
| 9 | Mon 03/01/2027 | Sun 03/07/2027 |
| 10 | Mon 03/08/2027 | Sun 03/14/2027 |
| 11 | Mon 03/15/2027 | Sun 03/21/2027 |
| 12 | Mon 03/22/2027 | Sun 03/28/2027 |
| 13 | Mon 03/29/2027 | Sun 04/04/2027 |
| 14 | Mon 04/05/2027 | Sun 04/11/2027 |
| 15 | Mon 04/12/2027 | Sun 04/18/2027 |
| 16 | Mon 04/19/2027 | Sun 04/25/2027 |
| 17 | Mon 04/26/2027 | Sun 05/02/2027 |
| 18 | Mon 05/03/2027 | Sun 05/09/2027 |
| 19 | Mon 05/10/2027 | Sun 05/16/2027 |
| 20 | Mon 05/17/2027 | Sun 05/23/2027 |
| 21 | Mon 05/24/2027 | Sun 05/30/2027 |
| 22 | Mon 05/31/2027 | Sun 06/06/2027 |
| 23 | Mon 06/07/2027 | Sun 06/13/2027 |
| 24 | Mon 06/14/2027 | Sun 06/20/2027 |
| 25 | Mon 06/21/2027 | Sun 06/27/2027 |
| 26 | Mon 06/28/2027 | Sun 07/04/2027 |
| 27 | Mon 07/05/2027 | Sun 07/11/2027 |
| 28 | Mon 07/12/2027 | Sun 07/18/2027 |
| 29 | Mon 07/19/2027 | Sun 07/25/2027 |
| 30 | Mon 07/26/2027 | Sun 08/01/2027 |
| 31 | Mon 08/02/2027 | Sun 08/08/2027 |
| 32 | Mon 08/09/2027 | Sun 08/15/2027 |
| 33 | Mon 08/16/2027 | Sun 08/22/2027 |
| 34 | Mon 08/23/2027 | Sun 08/29/2027 |
| 35 | Mon 08/30/2027 | Sun 09/05/2027 |
| 36 | Mon 09/06/2027 | Sun 09/12/2027 |
| 37 | Mon 09/13/2027 | Sun 09/19/2027 |
| 38 | Mon 09/20/2027 | Sun 09/26/2027 |
| 39 | Mon 09/27/2027 | Sun 10/03/2027 |
| 40 | Mon 10/04/2027 | Sun 10/10/2027 |
| 41 | Mon 10/11/2027 | Sun 10/17/2027 |
| 42 | Mon 10/18/2027 | Sun 10/24/2027 |
| 43 | Mon 10/25/2027 | Sun 10/31/2027 |
| 44 | Mon 11/01/2027 | Sun 11/07/2027 |
| 45 | Mon 11/08/2027 | Sun 11/14/2027 |
| 46 | Mon 11/15/2027 | Sun 11/21/2027 |
| 47 | Mon 11/22/2027 | Sun 11/28/2027 |
| 48 | Mon 11/29/2027 | Sun 12/05/2027 |
| 49 | Mon 12/06/2027 | Sun 12/12/2027 |
| 50 | Mon 12/13/2027 | Sun 12/19/2027 |
| 51 | Mon 12/20/2027 | Sun 12/26/2027 |
| 52 | Mon 12/27/2027 | Sun 01/02/2028 |