Calendar Week Finder
Which dates are in week N?
Enter a week number and a year, get the seven dates it covers — and the reverse, a date to its week — with both the ISO and US conventions.
Questions people ask
The things that come up about calendar week finders, answered plainly.
What dates are in week 1?
Under ISO 8601, the week containing 4 January — so week 1 can start as early as 29 December of the previous year, or as late as 4 January.
Does week 53 exist?
In some years. A year has 53 ISO weeks when it begins on a Thursday, or is a leap year beginning on a Wednesday — 71 years in every 400.
Related tools
Printable calendars, week numbers, quarters, fiscal years and weekday finders.
Week Number CalculatorThe ISO week for any date, the US week beside it, the Monday-to-Sunday dates the week covers, and how many weeks the year has.
ISO Week CalculatorA date to its ISO week-date form and back — `2024-W29-2` — with the ISO year, which is not always the calendar year.
Weekly CalendarSeven days with their dates, week number, and the hours of the day down the side — a week planner you can print or share as a link.
Calendar GeneratorA clean grid for any month, with week numbers down the side, public holidays marked, and a start-of-week that follows your part of the world rather than an assumption.