ISO Week to Gregorian Date Converter
Convert from ISO Week to Gregorian: enter a date below and see it in the Gregorian calendar. The table further down lists the first day of every month of Gregorian year 2026 alongside the ISO Week date.
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Gregorian months in 2026
The first day of every Gregorian month, with the ISO Week date for the same day.
| ISO Week | Gregorian |
|---|---|
| 2026-W01-4 | 1 January 2026 |
| 2026-W05-7 | 1 February 2026 |
| 2026-W09-7 | 1 March 2026 |
| 2026-W14-3 | 1 April 2026 |
| 2026-W18-5 | 1 May 2026 |
| 2026-W23-1 | 1 June 2026 |
| 2026-W27-3 | 1 July 2026 |
| 2026-W31-6 | 1 August 2026 |
| 2026-W36-2 | 1 September 2026 |
| 2026-W40-4 | 1 October 2026 |
| 2026-W44-7 | 1 November 2026 |
| 2026-W49-2 | 1 December 2026 |
About these calendars
ISO Week Date
The ISO week date system is part of the ISO 8601 standard for representing dates. It defines a year as having either 52 or 53 full weeks, with each week starting on Monday. It is widely used in business, government, and manufacturing for scheduling and fiscal planning.
Used in: International (business, industry, government)
Gregorian
The Gregorian calendar is the most widely used civil calendar in the world. Introduced by Pope Gregory XIII in 1582 as a reform of the Julian calendar, it corrected the drift in the date of Easter by refining the leap year rule. It is a solar calendar with 365 days in a common year and 366 in a leap year.
Used in: Worldwide