Week 1 in 1866
Week 1 of 1866 begins on January 1, 1866 and ends on January 7, 1866. It covers days 1 to 7 of the year and falls in quarter 1.
Weeks since this week: 8386
Week 1 of 1866 at a glance
| Starts (Monday) | January 1, 1866 |
|---|---|
| Ends (Sunday) | January 7, 1866 |
| US week (Sunday to Saturday) | 1 (December 31, 1865) |
| Month | January |
| Quarter | Q1 |
| Days of the year | 1–7 |
| Year completed at the end of this week | 1.9% |
| Weeks left in 1866 after this week | 51 |
| Weeks in 1866 | 52 |
| Even or odd week | Odd |
Calendar for January 1866
Download Calendar in printable A4 PDF
(US version) (EU/ISO Version)
All Weeks in 1866:
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 1866. It runs from December 31, 1865 to January 6, 1866.
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 1864 | January 4, 1864 | January 10, 1864 |
| Week 1 in 1865 | January 2, 1865 | January 8, 1865 |
| Week 1 in 1867 | December 31, 1866 | January 6, 1867 |
| Week 1 in 1868 | December 30, 1867 | January 5, 1868 |
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 1866 began on January 1, 1866. 1866 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.
Frequently Asked Questions (FAQ)
When does week 1 of 1866 start and end?
Week 1 of 1866 starts on January 1, 1866 and ends on January 7, 1866 (ISO 8601, Monday to Sunday).
Which month is week 1 of 1866 in?
Week 1 of 1866 is in January.
What dates are in week 1 of 1866?
January 1, 1866, January 2, 1866, January 3, 1866, January 4, 1866, January 5, 1866, January 6, 1866, and January 7, 1866
How many weeks does 1866 have?
1866 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 1866. It runs from December 31, 1865 to January 6, 1866.