Week 1 in 5781
Week 1 of 5781 begins on January 1, 5781 and ends on January 7, 5781. It covers days 1 to 7 of the year and falls in quarter 1.
Weeks until this week: 195885
Week 1 of 5781 at a glance
| Starts (Monday) | January 1, 5781 |
|---|---|
| Ends (Sunday) | January 7, 5781 |
| US week (Sunday to Saturday) | 1 (December 31, 5780) |
| Month | January |
| Quarter | Q1 |
| Days of the year | 1–7 |
| Year completed at the end of this week | 1.9% |
| Weeks left in 5781 after this week | 51 |
| Weeks in 5781 | 52 |
| Even or odd week | Odd |
Calendar for January 5781
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(US version) (EU/ISO Version)
All Weeks in 5781:
Past & Future Week Number 1:
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 1 of 5781. It runs from December 31, 5780 to January 6, 5781.
Even and odd weeks
Week 1 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 1 in other years
| From | To | |
|---|---|---|
| Week 1 in 5779 | January 4, 5779 | January 10, 5779 |
| Week 1 in 5780 | January 3, 5780 | January 9, 5780 |
| Week 1 in 5782 | December 31, 5781 | January 6, 5782 |
| Week 1 in 5783 | December 30, 5782 | January 5, 5783 |
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 5781 began on January 1, 5781. 5781 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 1 of 5781 start and end?
Week 1 of 5781 starts on January 1, 5781 and ends on January 7, 5781 (ISO 8601, Monday to Sunday).
Which month is week 1 of 5781 in?
Week 1 of 5781 is in January.
What dates are in week 1 of 5781?
January 1, 5781, January 2, 5781, January 3, 5781, January 4, 5781, January 5, 5781, January 6, 5781, and January 7, 5781
How many weeks does 5781 have?
5781 has 52 ISO weeks.
Is week 1 an even or odd week?
Week 1 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 1 of 5781. It runs from December 31, 5780 to January 6, 5781.