Week 12, 2027
March 22–28, 2027
Monday March 22 – Sunday March 282027-W12Days 81–87
The seven days
| Date | ISO week date | Day of year | US week | Islamic date (computed) | Holidays and other dates |
|---|---|---|---|---|---|
| Mon, Mar 22 | 2027-W12-1 | 081 | 13 | 14 Shawwal 1448 AH | Human Rights Day (substitute day) (South Africa); Vernal Equinox Day (substitute day) (Japan) |
| Tue, Mar 23 | 2027-W12-2 | 082 | 13 | 15 Shawwal 1448 AH | |
| Wed, Mar 24 | 2027-W12-3 | 083 | 13 | 16 Shawwal 1448 AH | |
| Thu, Mar 25 | 2027-W12-4 | 084 | 13 | 17 Shawwal 1448 AH | |
| Fri, Mar 26 | 2027-W12-5 | 085 | 13 | 18 Shawwal 1448 AH | Good Friday (13 sets) |
| Sat, Mar 27 | 2027-W12-6 | 086 | 13 | 19 Shawwal 1448 AH | Easter Saturday (Australia: New South Wales); The day after Good Friday (Australia: Queensland); The day following Good Friday (Hong Kong) |
| Sun, Mar 28 | 2027-W12-7 | 087 | 14 | 20 Shawwal 1448 AH | Easter Sunday (Australia: New South Wales, Australia: Queensland, Australia: Western Australia); Easter Sunday |
About week 12
In US numbering, where weeks start on Sunday and the week of January 1 is week 1, Monday to Saturday are US week 13 and Sunday US week 14.
Holidays this week: Human Rights Day (substitute day) on Mon, Mar 22 in South Africa; Vernal Equinox Day (substitute day) on Mon, Mar 22 in Japan; Good Friday on Fri, Mar 26 in 13 of the countries and regions we cover; Easter Saturday on Sat, Mar 27 in Australia: New South Wales; The day after Good Friday on Sat, Mar 27 in Australia: Queensland; The day following Good Friday on Sat, Mar 27 in Hong Kong; Easter Sunday on Sun, Mar 28 in Australia: New South Wales, Australia: Queensland, Australia: Western Australia. On Sun, Mar 28 clocks in the United Kingdom and Ireland go forward one hour at 1:00 a.m. On Sun, Mar 28 clocks in the European Union (Central European Time) go forward one hour at 2:00 a.m. Also this week: Easter Sunday on Sun, Mar 28 (Western churches). All weeks of 2027 lists the neighbouring weeks.
Week 12 in other years
| Year | Week 12 runs |
|---|---|
| 2025 | Mon, Mar 17 – Sun, Mar 23 |
| 2026 | Mon, Mar 16 – Sun, Mar 22 |
| 2027 | Mon, Mar 22 – Sun, Mar 28 |
| 2028 | Mon, Mar 20 – Sun, Mar 26 |
| 2029 | Mon, Mar 19 – Sun, Mar 25 |
| 2030 | Mon, Mar 18 – Sun, Mar 24 |
In 2028, week 12 runs Mon, Mar 20 – Sun, Mar 26: 364 days later, 2 days earlier in the calendar. Over the 400-year cycle, the Monday of week 12 falls between March 15 and March 22.
By the end of week 12, 87 days of 2027 have passed (23.8% of the year), and 40 ISO weeks of 2027 remain. The week falls in Q1.
Writing week 12
ISO 8601 writes this week as 2027-W12 (basic format 2027W12), from 2027-W12-1 on Monday to -7 on Sunday. The week number page shows the spreadsheet and Python formulas that give these numbers.