Week 16 in 1231
Week 16 of 1231 begins on April 14, 1231 and ends on April 20, 1231. It covers days 104 to 110 of the year and falls in quarter 2.
Weeks since this week: 41505
Week 16 of 1231 at a glance
| Starts (Monday) | April 14, 1231 |
|---|---|
| Ends (Sunday) | April 20, 1231 |
| US week (Sunday to Saturday) | 16 (April 13, 1231) |
| Month | April |
| Quarter | Q2 |
| Days of the year | 104–110 |
| Year completed at the end of this week | 30.1% |
| Weeks left in 1231 after this week | 36 |
| Weeks in 1231 | 52 |
| Even or odd week | Even |
Calendar for April 1231
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(US version) (EU/ISO Version)
All Weeks in 1231:
Past & Future Week Number 16:
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 16 of 1231. It runs from April 13, 1231 to April 19, 1231.
Even and odd weeks
Week 16 is an even week. Even and odd week numbers are used for alternating schedules such as shift rotas, school timetables, custody arrangements and waste collection.
Week 16 in other years
| From | To | |
|---|---|---|
| Week 16 in 1229 | April 16, 1229 | April 22, 1229 |
| Week 16 in 1230 | April 15, 1230 | April 21, 1230 |
| Week 16 in 1232 | April 12, 1232 | April 18, 1232 |
| Week 16 in 1233 | April 18, 1233 | April 24, 1233 |
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 1231 began on December 30, 1230. 1231 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 16 of 1231 start and end?
Week 16 of 1231 starts on April 14, 1231 and ends on April 20, 1231 (ISO 8601, Monday to Sunday).
Which month is week 16 of 1231 in?
Week 16 of 1231 is in April.
What dates are in week 16 of 1231?
April 14, 1231, April 15, 1231, April 16, 1231, April 17, 1231, April 18, 1231, April 19, 1231, and April 20, 1231
How many weeks does 1231 have?
1231 has 52 ISO weeks.
Is week 16 an even or odd week?
Week 16 is an even 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 16 of 1231. It runs from April 13, 1231 to April 19, 1231.