Week 18, 2027
May 3–9, 2027
Monday May 3 – Sunday May 92027-W18Days 123–129
The seven days
| Date | ISO week date | Day of year | US week | Islamic date (computed) | Holidays and other dates |
|---|---|---|---|---|---|
| Mon, May 3 | 2027-W18-1 | 123 | 19 | 26 Dhu al-Qa'dah 1448 AH | Early May bank holiday (UK: England and Wales, UK: Scotland, UK: Northern Ireland); Labour Day (Australia: Queensland); May Bank Holiday (Ireland); Constitution Memorial Day (Japan) |
| Tue, May 4 | 2027-W18-2 | 124 | 19 | 27 Dhu al-Qa'dah 1448 AH | Greenery Day (Japan) |
| Wed, May 5 | 2027-W18-3 | 125 | 19 | 28 Dhu al-Qa'dah 1448 AH | Children's Day (Japan) |
| Thu, May 6 | 2027-W18-4 | 126 | 19 | 29 Dhu al-Qa'dah 1448 AH | Ascension Day (France) |
| Fri, May 7 | 2027-W18-5 | 127 | 19 | 1 Dhu al-Hijjah 1448 AH | |
| Sat, May 8 | 2027-W18-6 | 128 | 19 | 2 Dhu al-Hijjah 1448 AH | Victory in Europe Day (Victoire 1945) (France) |
| Sun, May 9 | 2027-W18-7 | 129 | 20 | 3 Dhu al-Hijjah 1448 AH | Mother’s Day (US, Canada) |
About week 18
In US numbering, where weeks start on Sunday and the week of January 1 is week 1, Monday to Saturday are US week 19 and Sunday US week 20.
Holidays this week: Early May bank holiday on Mon, May 3 in UK: England and Wales, UK: Scotland, UK: Northern Ireland; Labour Day on Mon, May 3 in Australia: Queensland; May Bank Holiday on Mon, May 3 in Ireland; Constitution Memorial Day on Mon, May 3 in Japan; Greenery Day on Tue, May 4 in Japan; Children's Day on Wed, May 5 in Japan; Ascension Day on Thu, May 6 in France; Victory in Europe Day (Victoire 1945) on Sat, May 8 in France. 1 Dhu al-Hijjah 1448 AH falls on Fri, May 7 by the Umm al-Qura calendar (computed). Also this week: Mother’s Day (US, Canada) on Sun, May 9 (second Sunday in May). All weeks of 2027 lists the neighbouring weeks.
Week 18 in other years
| Year | Week 18 runs |
|---|---|
| 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 |
| 2030 | Mon, Apr 29 – Sun, May 5 |
In 2028, week 18 runs Mon, May 1 – Sun, May 7: 364 days later, 2 days earlier 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, 129 days of 2027 have passed (35.3% of the year), and 34 ISO weeks of 2027 remain. The week falls in Q2.
Writing week 18
ISO 8601 writes this week as 2027-W18 (basic format 2027W18), from 2027-W18-1 on Monday to -7 on Sunday. The week number page shows the spreadsheet and Python formulas that give these numbers.