Week 12 of 2021 runs March 22, 2021 to March 28, 2021.
Week 12 starts on Monday, March 22, 2021 and ends on Sunday, March 28, 2021. It's the 81st day of the year, sits in Q1, and falls in March. By the end of this week, 87 of 365 days are gone, putting 2021 at 23.8%.
There are no public holidays this week, so all 5 weekdays are working days. Need a different week? Browse the full 2021 week calendar, or jump to this week's number.
Week 12 at a glance
The 7 days of week 12
Every date in week 12 of 2021, Monday through Sunday, with day-of-year numbers and events.
| Day | Date | Day no. | Type | Events |
|---|---|---|---|---|
| Monday | Day 81 | Weekday | ||
| Tuesday | Day 82 | Weekday | ||
| Wednesday | Day 83 | Weekday | ||
| Thursday | Day 84 | Weekday | ||
| Friday | Day 85 | Weekday | ||
| Saturday | Day 86 | Weekend | ||
| Sunday | Day 87 | Weekend |
What week 12 of 2021 means
ISO 8601 numbers weeks so every week starts on Monday and ends on Sunday. Week 1 is the one holding the year's first Thursday, which is why early January can land in week 52 or 53 of the previous year. Week 12 is one piece of that system.
In 2021, week 12 covers Mar 22 – Mar 28, 2021. That's March, deep in Q1. The same week number shifts by a day or two each year, so week 12 in 2022 won't share these exact dates. The table below shows how it moves.
Want to check a specific date instead of a week number? The week calculator converts any date to its ISO week. Curious how many weeks a year holds? The weeks in a year guide explains 52 versus 53. And the ISO week number page covers the standard end to end.
Holidays in week 12 of 2021
🇬🇧 United Kingdom
Daylight Saving Time — Spring Forward
ObservanceWeek 12 across years
The same ISO week number lands on different dates each year. Here's how week 12 shifts.
| Year | From (Mon) | To (Sun) | Notable | |
|---|---|---|---|---|
| 2024 | view → |
Week 12 of 2021: questions and answers
What days are in week 12 of 2021?
Week 12 of 2021 runs from March 22, 2021 (Monday) through March 28, 2021 (Sunday). It spans March.
What month is week 12 in 2021?
Week 12 of 2021 falls entirely in March 2021.
How many working days are in week 12 of 2021?
Week 12 of 2021 has 5 working days.
What quarter is week 12 of 2021 in?
Week 12 of 2021 is in Q1 (2021). The week starts on day 81 of 365.
What is ISO week 12?
ISO week 12 is defined by the ISO 8601 international standard. It begins on Monday, March 22, 2021, and ends on Sunday, March 28, 2021. It is week 23% through the ISO year 2021.