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week number calculator returns the ISO 8601 week number for a date — the standard used across business, logistics and Europe, where weeks run Monday to Sunday and week 1 is the week containing the first Thursday of the year. It also gives the ISO week-numbering year, the calendar quarter, the day-of-year number and how many weeks are left in the year. The tool reports the ISO week-numbering year separately so that mismatch is clear.For example, under the ISO rule a year has 52 or 53 weeks, each running Monday to Sunday, and week 1 is defined as the week that holds the year’s first Thursday (equivalently, the week containing 4 January).For example, 1 January 2026 falls in ISO week 1 of 2026, but 1 January 2023 (a Sunday) sits in ISO week 52 of 2022.For example, 1 January 2026 falls in ISO week 52 of 2022, but 1 January 2023 falls in ISO week 52 of 2023.For example, 1 January 2026 falls in ISO week 52, but 1 January 2023 falls in ISO week 52 of 2023.For example, 1 January 2026 falls in ISO week 52, but 1 January 2023 falls in ISO week 52 of 2023.For example, 1 January 2026 falls in ISO week 52, but 1 January 2023 falls in ISO week 52, but 1 January 2023 falls in ISO week 52 of 2023.For example, 1 January 2026 falls in ISO week 52, but 1 January 2023 falls in ISO week 52, but 1 January 2023 falls in ISO week 52, but 1 January 2023 falls in ISO week 52, but 1 January 2023 falls in ISO week 52.For example,