53 Monday–Sunday weeks
Every ISO 8601 week of 2026 with its code, Monday and Sunday dates, month and quarter. Select a week for its daily dates and holidays.
Current week: week 42 (2026-W42), Monday, October 12 – Sunday, October 18, 2026. Today is Tuesday, October 13, 2026.
| Week | ISO code | Monday | Sunday | Month | Quarter |
|---|---|---|---|---|---|
| 1 | 2026-W01 | Dec/Jan | Q1 | ||
| 2 | 2026-W02 | Jan | Q1 | ||
| 3 | 2026-W03 | Jan | Q1 | ||
| 4 | 2026-W04 | Jan | Q1 | ||
| 5 | 2026-W05 | Jan/Feb | Q1 | ||
| 6 | 2026-W06 | Feb | Q1 | ||
| 7 | 2026-W07 | Feb | Q1 | ||
| 8 | 2026-W08 | Feb | Q1 | ||
| 9 | 2026-W09 | Feb/Mar | Q1 | ||
| 10 | 2026-W10 | Mar | Q1 | ||
| 11 | 2026-W11 | Mar | Q1 | ||
| 12 | 2026-W12 | Mar | Q1 | ||
| 13 | 2026-W13 | Mar | Q1 | ||
| 14 | 2026-W14 | Mar/Apr | Q2 | ||
| 15 | 2026-W15 | Apr | Q2 | ||
| 16 | 2026-W16 | Apr | Q2 | ||
| 17 | 2026-W17 | Apr | Q2 | ||
| 18 | 2026-W18 | Apr/May | Q2 | ||
| 19 | 2026-W19 | May | Q2 | ||
| 20 | 2026-W20 | May | Q2 | ||
| 21 | 2026-W21 | May | Q2 | ||
| 22 | 2026-W22 | May | Q2 | ||
| 23 | 2026-W23 | Jun | Q2 | ||
| 24 | 2026-W24 | Jun | Q2 | ||
| 25 | 2026-W25 | Jun | Q2 | ||
| 26 | 2026-W26 | Jun | Q2 | ||
| 27 | 2026-W27 | Jun/Jul | Q3 | ||
| 28 | 2026-W28 | Jul | Q3 | ||
| 29 | 2026-W29 | Jul | Q3 | ||
| 30 | 2026-W30 | Jul | Q3 | ||
| 31 | 2026-W31 | Jul/Aug | Q3 | ||
| 32 | 2026-W32 | Aug | Q3 | ||
| 33 | 2026-W33 | Aug | Q3 | ||
| 34 | 2026-W34 | Aug | Q3 | ||
| 35 | 2026-W35 | Aug | Q3 | ||
| 36 | 2026-W36 | Aug/Sep | Q3 | ||
| 37 | 2026-W37 | Sep | Q3 | ||
| 38 | 2026-W38 | Sep | Q3 | ||
| 39 | 2026-W39 | Sep | Q3 | ||
| 40 | 2026-W40 | Sep/Oct | Q4 | ||
| 41 | 2026-W41 | Oct | Q4 | ||
| 42 | 2026-W42 | Oct | Q4 | ||
| 43 | 2026-W43 | Oct | Q4 | ||
| 44 | 2026-W44 | Oct/Nov | Q4 | ||
| 45 | 2026-W45 | Nov | Q4 | ||
| 46 | 2026-W46 | Nov | Q4 | ||
| 47 | 2026-W47 | Nov | Q4 | ||
| 48 | 2026-W48 | Nov | Q4 | ||
| 49 | 2026-W49 | Nov/Dec | Q4 | ||
| 50 | 2026-W50 | Dec | Q4 | ||
| 51 | 2026-W51 | Dec | Q4 | ||
| 52 | 2026-W52 | Dec | Q4 | ||
| 53 | 2026-W53 | Dec/Jan | Q4 |
2026 is a long ISO year with 53 weeks, because January 1, 2026 is a Thursday. That happens only about 71 times in 400 years (roughly every 5 to 6 years).
Week 1 runs Monday, December 29, 2025 – Sunday, January 4, 2026. The last week, week 53, runs Monday, December 28, 2026 – Sunday, January 3, 2027.
Counting US-style instead (Sunday-start weeks, week 1 contains January 1), December 31, 2026, a Thursday, falls in US week 53.
The ISO code combines the ISO year and a zero-padded week number, such as 2026-W01. The month column shows when a week crosses a month boundary. The quarter is based on the week's Thursday, which also determines its ISO year.
The first and final ISO weeks can include dates from an adjacent calendar year. Use the ISO code when a project plan must stay unambiguous.