Week 1 in 4
Week 1 of 4 spans the turn of the year: it begins on December 29, 3 and ends on January 4, 4.
Weeks since this week: 105542
Week 1 of 4 at a glance
| Starts (Monday) | December 29, 3 |
|---|---|
| Ends (Sunday) | January 4, 4 |
| US week (Sunday to Saturday) | 1 (December 28, 3) |
| Month | December / January |
| Quarter | Q1 |
| Year completed at the end of this week | 1.1% |
| Weeks left in 4 after this week | 52 |
| Weeks in 4 | 53 |
| Even or odd week | Odd |
Calendar for December 4
Download Calendar in printable A4 PDF
(US version) (EU/ISO Version)
All Weeks in 4:
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 4. It runs from December 28, 3 to January 3, 4.
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 2 | December 31, 1 | January 6, 2 |
| Week 1 in 3 | December 30, 2 | January 5, 3 |
| Week 1 in 5 | January 3, 5 | January 9, 5 |
| Week 1 in 6 | January 2, 6 | January 8, 6 |
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 4 began on December 29, 3. 4 has 53 ISO weeks, because 1 January 4 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 4 start and end?
Week 1 of 4 starts on December 29, 3 and ends on January 4, 4 (ISO 8601, Monday to Sunday).
Which month is week 1 of 4 in?
Week 1 of 4 starts in December and ends in January.
What dates are in week 1 of 4?
December 29, 3, December 30, 3, December 31, 3, January 1, 4, January 2, 4, January 3, 4, and January 4, 4
How many weeks does 4 have?
4 has 53 ISO weeks, because 1 January 4 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 4. It runs from December 28, 3 to January 3, 4.