Week 39 in 1981
Week 39 of 1981 begins on September 21, 1981 and ends on September 27, 1981. It covers days 264 to 270 of the year and falls in quarter 3.
Weeks since this week: 2349
Week 39 of 1981 at a glance
| Starts (Monday) | September 21, 1981 |
|---|---|
| Ends (Sunday) | September 27, 1981 |
| US week (Sunday to Saturday) | 39 (September 20, 1981) |
| Month | September |
| Quarter | Q3 |
| Days of the year | 264–270 |
| Year completed at the end of this week | 74.0% |
| Weeks left in 1981 after this week | 14 |
| Weeks in 1981 | 53 |
| Even or odd week | Odd |
Calendar for September 1981
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(US version) (EU/ISO Version)
All Weeks in 1981:
Past & Future Week Number 39:
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 39 of 1981. It runs from September 20, 1981 to September 26, 1981.
Even and odd weeks
Week 39 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 39 in other years
| From | To | |
|---|---|---|
| Week 39 in 1979 | September 24, 1979 | September 30, 1979 |
| Week 39 in 1980 | September 22, 1980 | September 28, 1980 |
| Week 39 in 1982 | September 27, 1982 | October 3, 1982 |
| Week 39 in 1983 | September 26, 1983 | October 2, 1983 |
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 1981 began on December 29, 1980. 1981 has 53 ISO weeks, because 1 January 1981 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.
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Frequently Asked Questions (FAQ)
When does week 39 of 1981 start and end?
Week 39 of 1981 starts on September 21, 1981 and ends on September 27, 1981 (ISO 8601, Monday to Sunday).
Which month is week 39 of 1981 in?
Week 39 of 1981 is in September.
What dates are in week 39 of 1981?
September 21, 1981, September 22, 1981, September 23, 1981, September 24, 1981, September 25, 1981, September 26, 1981, and September 27, 1981
How many weeks does 1981 have?
1981 has 53 ISO weeks, because 1 January 1981 falls on a Thursday.
Is week 39 an even or odd week?
Week 39 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 39 of 1981. It runs from September 20, 1981 to September 26, 1981.