Week 21 in 991
Week 21 of 991 begins on May 23, 991 and ends on May 29, 991. It covers days 143 to 149 of the year and falls in quarter 2.
Weeks since this week: 54022
Week 21 of 991 at a glance
| Starts (Monday) | May 23, 991 |
|---|---|
| Ends (Sunday) | May 29, 991 |
| US week (Sunday to Saturday) | 22 (May 22, 991) |
| Month | May |
| Quarter | Q2 |
| Days of the year | 143–149 |
| Year completed at the end of this week | 40.8% |
| Weeks left in 991 after this week | 31 |
| Weeks in 991 | 52 |
| Even or odd week | Odd |
Calendar for May 991
Download Calendar in printable A4 PDF
(US version) (EU/ISO Version)
All Weeks in 991:
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 22 of 991. It runs from May 22, 991 to May 28, 991.
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 989 | May 18, 989 | May 24, 989 |
| Week 21 in 990 | May 24, 990 | May 30, 990 |
| Week 21 in 992 | May 21, 992 | May 27, 992 |
| Week 21 in 993 | May 20, 993 | May 26, 993 |
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 991 began on January 3, 991. 991 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 991 start and end?
Week 21 of 991 starts on May 23, 991 and ends on May 29, 991 (ISO 8601, Monday to Sunday).
Which month is week 21 of 991 in?
Week 21 of 991 is in May.
What dates are in week 21 of 991?
May 23, 991, May 24, 991, May 25, 991, May 26, 991, May 27, 991, May 28, 991, and May 29, 991
How many weeks does 991 have?
991 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 22 of 991. It runs from May 22, 991 to May 28, 991.