Week 1 in 2161
Week 1 of 2161 spans the turn of the year: it begins on December 29, 2160 and ends on January 4, 2161.
Weeks until this week: 7006
Week 1 of 2161 at a glance
| Starts (Monday) | December 29, 2160 |
|---|---|
| Ends (Sunday) | January 4, 2161 |
| US week (Sunday to Saturday) | 1 (December 28, 2160) |
| Month | December / January |
| Quarter | Q1 |
| Year completed at the end of this week | 1.1% |
| Weeks left in 2161 after this week | 52 |
| Weeks in 2161 | 53 |
| Even or odd week | Odd |
Calendar for December 2161
Download Calendar in printable A4 PDF
(US version) (EU/ISO Version)
All Weeks in 2161:
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 2161. It runs from December 28, 2160 to January 3, 2161.
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 2159 | January 1, 2159 | January 7, 2159 |
| Week 1 in 2160 | December 31, 2159 | January 6, 2160 |
| Week 1 in 2162 | January 4, 2162 | January 10, 2162 |
| Week 1 in 2163 | January 3, 2163 | January 9, 2163 |
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 2161 began on December 29, 2160. 2161 has 53 ISO weeks, because 1 January 2161 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.
Frequently Asked Questions (FAQ)
When does week 1 of 2161 start and end?
Week 1 of 2161 starts on December 29, 2160 and ends on January 4, 2161 (ISO 8601, Monday to Sunday).
Which month is week 1 of 2161 in?
Week 1 of 2161 starts in December and ends in January.
What dates are in week 1 of 2161?
December 29, 2160, December 30, 2160, December 31, 2160, January 1, 2161, January 2, 2161, January 3, 2161, and January 4, 2161
How many weeks does 2161 have?
2161 has 53 ISO weeks, because 1 January 2161 falls on a Thursday.
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 2161. It runs from December 28, 2160 to January 3, 2161.