What Week: Week 13
Find the calendar dates covered by any ISO week number.
ISO Week 13 of 2026 runs from March 23 to March 29, 2026, with roughly 39 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. Palm Sunday falls within this week in 2026. Next year, 2027, the same week number runs from March 29 to April 4, 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 13 falls in the first half of the year, roughly 25% of the way through 2026's 52-53 ISO weeks.
Quarter Overlap
This week sits in calendar Q1, based on its Monday (March 23).