Week 21 in 1660
Week 21 of 1660 begins on May 17, 1660 and ends on May 23, 1660. It covers days 138 to 144 of the year and falls in quarter 2.
Weeks since this week: 19115
Week 21 of 1660 at a glance
| Starts (Monday) | May 17, 1660 |
|---|---|
| Ends (Sunday) | May 23, 1660 |
| US week (Sunday to Saturday) | 21 (May 16, 1660) |
| Month | May |
| Quarter | Q2 |
| Days of the year | 138–144 |
| Year completed at the end of this week | 39.3% |
| Weeks left in 1660 after this week | 32 |
| Weeks in 1660 | 53 |
| Even or odd week | Odd |
Calendar for May 1660
Download Calendar in printable A4 PDF
(US version) (EU/ISO Version)
All Weeks in 1660:
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 1660. It runs from May 16, 1660 to May 22, 1660.
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 1658 | May 20, 1658 | May 26, 1658 |
| Week 21 in 1659 | May 19, 1659 | May 25, 1659 |
| Week 21 in 1661 | May 23, 1661 | May 29, 1661 |
| Week 21 in 1662 | May 22, 1662 | May 28, 1662 |
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 1660 began on December 29, 1659. 1660 has 53 ISO weeks, because 1 January 1660 falls on a Thursday.
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 1660 start and end?
Week 21 of 1660 starts on May 17, 1660 and ends on May 23, 1660 (ISO 8601, Monday to Sunday).
Which month is week 21 of 1660 in?
Week 21 of 1660 is in May.
What dates are in week 21 of 1660?
May 17, 1660, May 18, 1660, May 19, 1660, May 20, 1660, May 21, 1660, May 22, 1660, and May 23, 1660
How many weeks does 1660 have?
1660 has 53 ISO weeks, because 1 January 1660 falls on a Thursday.
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 1660. It runs from May 16, 1660 to May 22, 1660.