Week 51 in 2011
Week 51 of 2011 begins on December 19, 2011 and ends on December 25, 2011. It covers days 353 to 359 of the year and falls in quarter 4.
Weeks since this week: 771
Week 51 of 2011 at a glance
| Starts (Monday) | December 19, 2011 |
|---|---|
| Ends (Sunday) | December 25, 2011 |
| US week (Sunday to Saturday) | 52 (December 18, 2011) |
| Month | December |
| Quarter | Q4 |
| Days of the year | 353–359 |
| Year completed at the end of this week | 98.4% |
| Weeks left in 2011 after this week | 1 |
| Weeks in 2011 | 52 |
| Even or odd week | Odd |
Calendar for December 2011
Download Calendar in printable A4 PDF
(US version) (EU/ISO Version)
All Weeks in 2011:
Past & Future Week Number 51:
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 52 of 2011. It runs from December 18, 2011 to December 24, 2011.
Even and odd weeks
Week 51 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 51 in other years
| From | To | |
|---|---|---|
| Week 51 in 2009 | December 14, 2009 | December 20, 2009 |
| Week 51 in 2010 | December 20, 2010 | December 26, 2010 |
| Week 51 in 2012 | December 17, 2012 | December 23, 2012 |
| Week 51 in 2013 | December 16, 2013 | December 22, 2013 |
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 2011 began on January 3, 2011. 2011 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 51 of 2011 start and end?
Week 51 of 2011 starts on December 19, 2011 and ends on December 25, 2011 (ISO 8601, Monday to Sunday).
Which month is week 51 of 2011 in?
Week 51 of 2011 is in December.
What dates are in week 51 of 2011?
December 19, 2011, December 20, 2011, December 21, 2011, December 22, 2011, December 23, 2011, December 24, 2011, and December 25, 2011
How many weeks does 2011 have?
2011 has 52 ISO weeks.
Is week 51 an even or odd week?
Week 51 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 52 of 2011. It runs from December 18, 2011 to December 24, 2011.