Week 13, 2027
March 29 – April 4, 2027
Monday March 29 – Sunday April 42027-W13Days 88–94
The seven days
| Date | ISO week date | Day of year | US week | Islamic date (computed) | Holidays and other dates |
|---|---|---|---|---|---|
| Mon, Mar 29 | 2027-W13-1 | 088 | 14 | 21 Shawwal 1448 AH | Easter Monday (10 sets); Family Day (South Africa) |
| Tue, Mar 30 | 2027-W13-2 | 089 | 14 | 22 Shawwal 1448 AH | |
| Wed, Mar 31 | 2027-W13-3 | 090 | 14 | 23 Shawwal 1448 AH | |
| Thu, Apr 1 | 2027-W13-4 | 091 | 14 | 24 Shawwal 1448 AH | |
| Fri, Apr 2 | 2027-W13-5 | 092 | 14 | 25 Shawwal 1448 AH | |
| Sat, Apr 3 | 2027-W13-6 | 093 | 14 | 26 Shawwal 1448 AH | |
| Sun, Apr 4 | 2027-W13-7 | 094 | 15 | 27 Shawwal 1448 AH |
About week 13
The week spans two months: it starts in March and ends in April, with April 1 on Thursday, the first day of Q2. In US numbering, where weeks start on Sunday and the week of January 1 is week 1, Monday to Saturday are US week 14 and Sunday US week 15.
Holidays this week: Easter Monday on Mon, Mar 29 in 10 of the countries and regions we cover; Family Day on Mon, Mar 29 in South Africa. On Sun, Apr 4 clocks in South-east Australia (Sydney, Melbourne) go back one hour at 3:00 a.m. On Sun, Apr 4 clocks in New Zealand go back one hour at 3:00 a.m. All weeks of 2027 lists the neighbouring weeks.
Week 13 in other years
| Year | Week 13 runs |
|---|---|
| 2025 | Mon, Mar 24 – Sun, Mar 30 |
| 2026 | Mon, Mar 23 – Sun, Mar 29 |
| 2027 | Mon, Mar 29 – Sun, Apr 4 |
| 2028 | Mon, Mar 27 – Sun, Apr 2 |
| 2029 | Mon, Mar 26 – Sun, Apr 1 |
| 2030 | Mon, Mar 25 – Sun, Mar 31 |
In 2028, week 13 runs Mon, Mar 27 – Sun, Apr 2: 364 days later, 2 days earlier in the calendar. Over the 400-year cycle, the Monday of week 13 falls between March 22 and March 29.
By the end of week 13, 94 days of 2027 have passed (25.8% of the year), and 39 ISO weeks of 2027 remain. The week falls in Q1.
Writing week 13
ISO 8601 writes this week as 2027-W13 (basic format 2027W13), from 2027-W13-1 on Monday to -7 on Sunday. The week number page shows the spreadsheet and Python formulas that give these numbers.