Week 20 in 2021
Week 20 of 2021 begins on May 17, 2021 and ends on May 23, 2021. It covers days 137 to 143 of the year and falls in quarter 2.
Weeks since this week: 282
Week 20 of 2021 at a glance
| Starts (Monday) | May 17, 2021 |
|---|---|
| Ends (Sunday) | May 23, 2021 |
| US week (Sunday to Saturday) | 21 (May 16, 2021) |
| Month | May |
| Quarter | Q2 |
| Days of the year | 137–143 |
| Year completed at the end of this week | 39.2% |
| Weeks left in 2021 after this week | 32 |
| Weeks in 2021 | 52 |
| Even or odd week | Even |
Calendar for May 2021
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(US version) (EU/ISO Version)
All Weeks in 2021:
Past & Future Week Number 20:
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 2021. It runs from May 16, 2021 to May 22, 2021.
Even and odd weeks
Week 20 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 20 in other years
| From | To | |
|---|---|---|
| Week 20 in 2019 | May 13, 2019 | May 19, 2019 |
| Week 20 in 2020 | May 11, 2020 | May 17, 2020 |
| Week 20 in 2022 | May 16, 2022 | May 22, 2022 |
| Week 20 in 2023 | May 15, 2023 | May 21, 2023 |
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 2021 began on January 4, 2021. 2021 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.
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Frequently Asked Questions (FAQ)
When does week 20 of 2021 start and end?
Week 20 of 2021 starts on May 17, 2021 and ends on May 23, 2021 (ISO 8601, Monday to Sunday).
Which month is week 20 of 2021 in?
Week 20 of 2021 is in May.
What dates are in week 20 of 2021?
May 17, 2021, May 18, 2021, May 19, 2021, May 20, 2021, May 21, 2021, May 22, 2021, and May 23, 2021
How many weeks does 2021 have?
2021 has 52 ISO weeks.
Is week 20 an even or odd week?
Week 20 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 21 of 2021. It runs from May 16, 2021 to May 22, 2021.