What Week: Week 19
Find the calendar dates covered by any ISO week number.
ISO Week 19 of 2026 runs from May 4 to May 10, 2026, with roughly 33 ISO weeks remaining in the year after it. ISO 8601 weeks always run Monday through Sunday and belong to the year containing that week's Thursday, which is why the first few days of January sometimes belong to the final week of the previous year. Cinco de Mayo, Mother's Day fall within this week in 2026. Next year, 2027, the same week number runs from May 10 to May 16, 2027 instead, since the exact dates shift slightly every year.
As of October 1, 2026, 12:19 PM (America/New York).
Position in the Year
Week 19 falls in the first half of the year, roughly 37% of the way through 2026's 52-53 ISO weeks.
Quarter Overlap
This week sits in calendar Q2, based on its Monday (May 4).