What Week: Week 5
Find the calendar dates covered by any ISO week number.
ISO Week 5 of 2026 runs from January 26 to February 1, 2026, spanning two calendar months, with roughly 47 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. No major U.S. holidays tracked by Dayswise fall within this specific week in 2026. Next year, 2027, the same week number runs from February 1 to February 7, 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 5 falls in the first half of the year, roughly 10% of the way through 2026's 52-53 ISO weeks.
Quarter Overlap
This week sits in calendar Q1, based on its Monday (January 26).