ISO Week · 2026 · Q1
Week 12
2026 · –
March · 5 working days · 23% through 2026
Week 12 of 2026 runs March 16, 2026 to March 22, 2026.
Week 12 starts on Monday, March 16, 2026 and ends on Sunday, March 22, 2026. It's the 75th day of the year, sits in Q1, and falls in March. By the end of this week, 81 of 365 days are gone, putting 2026 at 22.2%.
This week includes St. Patrick's Day, so it has 5 working days instead of the usual 5. Need a different week? Browse the full 2026 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 2026, Monday through Sunday, with day-of-year numbers and events.
| Day | Date | Day no. | Type | Events |
|---|---|---|---|---|
| Monday | Day 75 | Weekday | ||
| Tuesday | Day 76 | Weekday | St. Patrick's Day | |
| Wednesday | Day 77 | Weekday | ||
| Thursday | Day 78 | Weekday | ||
| Friday | Day 79 | Weekday | Spring Equinox (Vernal) | |
| Saturday | Day 80 | Weekend | ||
| Sunday | Day 81 | Weekend |
What week 12 of 2026 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 2026, week 12 covers Mar 16 – Mar 22, 2026. That's March, deep in Q1. The same week number shifts by a day or two each year, so week 12 in 2027 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 2026
🇬🇧 United Kingdom
🇨🇦 Canada
🇦🇺 Australia
Week 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 → | |||
| 2025 | view → | |||
| 2026 THIS YEAR | ||||
| 2027 | Good Friday Easter Sunday | view → | ||
| 2028 | view → | |||
| 2029 | view → |
Week 12 of 2026: questions and answers
What days are in week 12 of 2026?
Week 12 of 2026 runs from March 16, 2026 (Monday) through March 22, 2026 (Sunday). It spans March.
What month is week 12 in 2026?
Week 12 of 2026 falls entirely in March 2026.
How many working days are in week 12 of 2026?
Week 12 of 2026 has 5 working days.
What week is Spring Equinox (Vernal) in 2026?
Spring Equinox (Vernal) falls in ISO week 12 of 2026 (Mar 16 – Mar 22, 2026).
What quarter is week 12 of 2026 in?
Week 12 of 2026 is in Q1 (2026). The week starts on day 75 of 365.
What is ISO week 12?
ISO week 12 is defined by the ISO 8601 international standard. It begins on Monday, March 16, 2026, and ends on Sunday, March 22, 2026. It is week 23% through the ISO year 2026.