Guides & articles
Clear, practical guides on week numbers, the ISO 8601 standard, pregnancy weeks and the calendar tools we build.
5 articles · Week Numbers
What quarter is it? Right now it's Q2 2026, running April 1 to June 30. See exact Q1, Q2, Q3 and Q4 dates for 2026, plu…
Work weeks in a year come to about 52, or 261 weekdays in 2026. See working day totals for the US, UK, Canada and Austr…
Week numbers 2026 in one place: the full ISO 8601 calendar of all 53 weeks, with exact Monday-to-Sunday dates for every…
US vs ISO week numbers, compared: ISO weeks start Monday with a first-Thursday rule; US weeks start Sunday and put Janu…
How many weeks are in a year? Every calendar year has 52 weeks plus 1 or 2 extra days, but in ISO 8601 some years, like…