Week 1 in 9
Week 1 of 9 spans the turn of the year: it begins on December 29, 8 and ends on January 4, 9.
Weeks since this week: 105281
Week 1 of 9 at a glance
| Starts (Monday) | December 29, 8 |
|---|---|
| Ends (Sunday) | January 4, 9 |
| US week (Sunday to Saturday) | 1 (December 28, 8) |
| Month | December / January |
| Quarter | Q1 |
| Year completed at the end of this week | 1.1% |
| Weeks left in 9 after this week | 52 |
| Weeks in 9 | 53 |
| Even or odd week | Odd |
Calendar for December 9
Download Calendar in printable A4 PDF
(US version) (EU/ISO Version)
All Weeks in 9:
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 9. It runs from December 28, 8 to January 3, 9.
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 7 | January 1, 7 | January 7, 7 |
| Week 1 in 8 | December 31, 7 | January 6, 8 |
| Week 1 in 10 | January 4, 10 | January 10, 10 |
| Week 1 in 11 | January 3, 11 | January 9, 11 |
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 9 began on December 29, 8. 9 has 53 ISO weeks, because 1 January 9 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 1 of 9 start and end?
Week 1 of 9 starts on December 29, 8 and ends on January 4, 9 (ISO 8601, Monday to Sunday).
Which month is week 1 of 9 in?
Week 1 of 9 starts in December and ends in January.
What dates are in week 1 of 9?
December 29, 8, December 30, 8, December 31, 8, January 1, 9, January 2, 9, January 3, 9, and January 4, 9
How many weeks does 9 have?
9 has 53 ISO weeks, because 1 January 9 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 9. It runs from December 28, 8 to January 3, 9.