Week 21 in 266
Week 21 of 266 begins on May 21, 266 and ends on May 27, 266. It covers days 141 to 147 of the year and falls in quarter 2.
Weeks since this week: 91851
Week 21 of 266 at a glance
| Starts (Monday) | May 21, 266 |
|---|---|
| Ends (Sunday) | May 27, 266 |
| US week (Sunday to Saturday) | 21 (May 20, 266) |
| Month | May |
| Quarter | Q2 |
| Days of the year | 141–147 |
| Year completed at the end of this week | 40.3% |
| Weeks left in 266 after this week | 31 |
| Weeks in 266 | 52 |
| Even or odd week | Odd |
Calendar for May 266
Download Calendar in printable A4 PDF
(US version) (EU/ISO Version)
All Weeks in 266:
Past & Future Week Number 21:
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 21 of 266. It runs from May 20, 266 to May 26, 266.
Even and odd weeks
Week 21 is an odd week. Even and odd week numbers are used for alternating schedules such as shift rotas, school timetables, custody arrangements and waste collection.
Week 21 in other years
| From | To | |
|---|---|---|
| Week 21 in 264 | May 23, 264 | May 29, 264 |
| Week 21 in 265 | May 22, 265 | May 28, 265 |
| Week 21 in 267 | May 20, 267 | May 26, 267 |
| Week 21 in 268 | May 18, 268 | May 24, 268 |
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 266 began on January 1, 266. 266 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 21 of 266 start and end?
Week 21 of 266 starts on May 21, 266 and ends on May 27, 266 (ISO 8601, Monday to Sunday).
Which month is week 21 of 266 in?
Week 21 of 266 is in May.
What dates are in week 21 of 266?
May 21, 266, May 22, 266, May 23, 266, May 24, 266, May 25, 266, May 26, 266, and May 27, 266
How many weeks does 266 have?
266 has 52 ISO weeks.
Is week 21 an even or odd week?
Week 21 is an odd 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 21 of 266. It runs from May 20, 266 to May 26, 266.