Week 40 in 2027
Week 40 of 2027 begins on October 4, 2027 and ends on October 10, 2027. It covers days 277 to 283 of the year and falls in quarter 4.
Weeks until this week: 51
Week 40 of 2027 at a glance
| Starts (Monday) | October 4, 2027 |
|---|---|
| Ends (Sunday) | October 10, 2027 |
| US week (Sunday to Saturday) | 41 (October 3, 2027) |
| Month | October |
| Quarter | Q4 |
| Days of the year | 277–283 |
| Year completed at the end of this week | 77.5% |
| Weeks left in 2027 after this week | 12 |
| Weeks in 2027 | 52 |
| Even or odd week | Even |
Calendar for October 2027
Download Calendar in printable A4 PDF
(US version) (EU/ISO Version)
All Weeks in 2027:
Past & Future Week Number 40:
US and ISO week numbers
In the US system, where weeks start on Sunday and week 1 is the week that contains 1 January, this is week 41 of 2027. It runs from October 3, 2027 to October 9, 2027.
Even and odd weeks
Week 40 is an even week. Even and odd week numbers are used for alternating schedules such as shift rotas, school timetables, custody arrangements and waste collection.
Week 40 in other years
| From | To | |
|---|---|---|
| Week 40 in 2025 | September 29, 2025 | October 5, 2025 |
| Week 40 in 2026 | September 28, 2026 | October 4, 2026 |
| Week 40 in 2028 | October 2, 2028 | October 8, 2028 |
| Week 40 in 2029 | October 1, 2029 | October 7, 2029 |
How week numbers are counted
Most of the world numbers weeks according to the ISO 8601 standard. A week starts on Monday, and week 1 is the week that contains the first Thursday of the year, which is always the week that contains 4 January.
Week 1 of 2027 began on January 4, 2027. 2027 has 52 ISO weeks.
Because of this rule, the first 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.
In the United States, weeks usually start on Sunday and week 1 is the week that contains 1 January, so the US week number can differ from the ISO week number.
Find the week number of a date
Frequently Asked Questions (FAQ)
When does week 40 of 2027 start and end?
Week 40 of 2027 starts on October 4, 2027 and ends on October 10, 2027 (ISO 8601, Monday to Sunday).
Which month is week 40 of 2027 in?
Week 40 of 2027 is in October.
What dates are in week 40 of 2027?
October 4, 2027, October 5, 2027, October 6, 2027, October 7, 2027, October 8, 2027, October 9, 2027, and October 10, 2027
How many weeks does 2027 have?
2027 has 52 ISO weeks.
Is week 40 an even or odd week?
Week 40 is an even week.
What is the US week number for this week?
In the US system, where weeks start on Sunday and week 1 is the week that contains 1 January, this is week 41 of 2027. It runs from October 3, 2027 to October 9, 2027.