Today is Week 26 of 2026 — Saturday, June 27, 2026
Today is Week 26 of 2026, according to the ISO 8601 week numbering standard. Week numbers are used extensively in business, logistics, manufacturing, and project scheduling, particularly in Europe and in international trade. ISO week numbers always run from Monday to Sunday.
Under the ISO 8601 standard, Week 1 of the year is defined as the week that contains the year's first Thursday. This also means Week 1 always contains January 4th. Weeks run from Monday to Sunday. A year may have either 52 or 53 weeks. Years with 53 weeks occur when January 1 falls on a Thursday, or on a Wednesday in a leap year.
Most countries in Europe, as well as international business standards, use the ISO 8601 week numbering system. However, the United States typically considers Sunday as the first day of the week, and some US week number systems count Week 1 as the week containing January 1, which can result in different week numbers than the ISO system for dates in early January.