Week 18, 2026
April 27 – May 3, 2026
Monday April 27 – Sunday May 32026-W18Days 117–123
The seven days
| Date | ISO week date | Day of year | US week | Islamic date (computed) | Holidays and other dates |
|---|---|---|---|---|---|
| Mon, Apr 27 | 2026-W18-1 | 117 | 18 | 10 Dhu al-Qa'dah 1447 AH | Anzac Day (additional day) (Australia: New South Wales, Australia: Western Australia); Anzac Day (Mondayised) (New Zealand); Freedom Day (South Africa) |
| Tue, Apr 28 | 2026-W18-2 | 118 | 18 | 11 Dhu al-Qa'dah 1447 AH | |
| Wed, Apr 29 | 2026-W18-3 | 119 | 18 | 12 Dhu al-Qa'dah 1447 AH | Showa Day (Japan) |
| Thu, Apr 30 | 2026-W18-4 | 120 | 18 | 13 Dhu al-Qa'dah 1447 AH | |
| Fri, May 1 | 2026-W18-5 | 121 | 18 | 14 Dhu al-Qa'dah 1447 AH | Workers' Day (South Africa); Labour Day (4 sets) |
| Sat, May 2 | 2026-W18-6 | 122 | 18 | 15 Dhu al-Qa'dah 1447 AH | |
| Sun, May 3 | 2026-W18-7 | 123 | 19 | 16 Dhu al-Qa'dah 1447 AH |
About week 18
The week spans two months: it starts in April and ends in May, with May 1 on Friday. In US numbering, where weeks start on Sunday and the week of January 1 is week 1, Monday to Saturday are US week 18 and Sunday US week 19.
Holidays this week: Anzac Day (additional day) on Mon, Apr 27 in Australia: New South Wales, Australia: Western Australia; Anzac Day (Mondayised) on Mon, Apr 27 in New Zealand; Freedom Day on Mon, Apr 27 in South Africa; Showa Day on Wed, Apr 29 in Japan; Workers' Day on Fri, May 1 in South Africa; Labour Day on Fri, May 1 in 4 of the countries and regions we cover. All weeks of 2026 lists the neighbouring weeks.
Week 18 in other years
| Year | Week 18 runs |
|---|---|
| 2024 | Mon, Apr 29 – Sun, May 5 |
| 2025 | Mon, Apr 28 – Sun, May 4 |
| 2026 | Mon, Apr 27 – Sun, May 3 |
| 2027 | Mon, May 3 – Sun, May 9 |
| 2028 | Mon, May 1 – Sun, May 7 |
| 2029 | Mon, Apr 30 – Sun, May 6 |
In 2027, week 18 runs Mon, May 3 – Sun, May 9: 2026 has 53 weeks, so the same number comes 371 days later, 6 days later in the calendar. Over the 400-year cycle, the Monday of week 18 falls between April 26 and May 3.
By the end of week 18, 123 days of 2026 have passed (33.7% of the year), and 35 ISO weeks of 2026 remain. The week falls in Q2.
Writing week 18
ISO 8601 writes this week as 2026-W18 (basic format 2026W18), from 2026-W18-1 on Monday to -7 on Sunday. The week number page shows the spreadsheet and Python formulas that give these numbers.