Week 18 in 2021
Week 18 of 2021 begins on May 3, 2021 and ends on May 9, 2021. It covers days 123 to 129 of the year and falls in quarter 2.
Weeks since this week: 284
Week 18 of 2021 at a glance
| Starts (Monday) | May 3, 2021 |
|---|---|
| Ends (Sunday) | May 9, 2021 |
| US week (Sunday to Saturday) | 19 (May 2, 2021) |
| Month | May |
| Quarter | Q2 |
| Days of the year | 123–129 |
| Year completed at the end of this week | 35.3% |
| Weeks left in 2021 after this week | 34 |
| 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 18:
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 19 of 2021. It runs from May 2, 2021 to May 8, 2021.
Even and odd weeks
Week 18 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 18 in other years
| From | To | |
|---|---|---|
| Week 18 in 2019 | April 29, 2019 | May 5, 2019 |
| Week 18 in 2020 | April 27, 2020 | May 3, 2020 |
| Week 18 in 2022 | May 2, 2022 | May 8, 2022 |
| Week 18 in 2023 | May 1, 2023 | May 7, 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 18 of 2021 start and end?
Week 18 of 2021 starts on May 3, 2021 and ends on May 9, 2021 (ISO 8601, Monday to Sunday).
Which month is week 18 of 2021 in?
Week 18 of 2021 is in May.
What dates are in week 18 of 2021?
May 3, 2021, May 4, 2021, May 5, 2021, May 6, 2021, May 7, 2021, May 8, 2021, and May 9, 2021
How many weeks does 2021 have?
2021 has 52 ISO weeks.
Is week 18 an even or odd week?
Week 18 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 19 of 2021. It runs from May 2, 2021 to May 8, 2021.