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Clear, practical guides on week numbers, the ISO 8601 standard, pregnancy weeks and the calendar tools we build.

3 articles · Tools & Tips

Tools & Tips 9 min read

World Cup 2026 Calendar: All 104 Games, Dates and .ics

World Cup 2026 calendar with all 104 games, flags, dates and kickoff times. Download the full schedule as an .ics and a…

June 4, 2026 Read →

Tools & Tips 7 min read

Week Number API: a free REST endpoint that returns the ISO 8601 week number for any date. No key, CORS enabled, with JS…

June 3, 2026 Read →

Tools & Tips 6 min read

Calculate the week number in Excel, Google Sheets, and Python with ISOWEEKNUM, WEEKNUM, and isocalendar(). Copy-paste f…

June 2, 2026 Read →