Calendar by Month and Year

A month or a whole year laid out by weekday, with ISO week numbers and holidays

Calendar by Month and Year

Calendar

How to Read This Calendar

What this calendar shows

Pick a month and a year and the page lays that month out week by week: every date under its weekday (the grid starts on Sunday), weekends in red and a ring around each holiday; under the grid, the number of days, the day-of-year span, the ISO 8601 weeks the month spans and the list of holidays with their dates. The "Year" option in the month list gathers the whole year into twelve compact grids, each one linking to its own month page.

The rule the grid is built on

Month lengths are fixed by the calendar itself, and February depends on whether the year is a leap year. The Gregorian rule is:

A year is a leap year when year % 4 = 0 and year % 100 ≠ 0, or when year % 400 = 0

That is why 2024 and 2028 are leap years, 2100 will not be, and 2000 was. The rule comes from the 1582 reform under Gregory XIII: the Julian year ran about 11 minutes longer than the astronomical one, and over sixteen centuries ten spare days had piled up. Dropping three leap years in every four hundred is what cancels the drift.

Week numbers follow ISO 8601: a week runs Monday to Sunday, and week 1 of a year is the one that contains its first Thursday.

Limits and caveats

  • The calendar is Gregorian and starts at 1583. For earlier dates a Gregorian weekday is a back-projection that disagrees with the historical record, so those pages do not exist here.
  • Week numbers are ISO 8601. The US convention, which calls the week containing January 1 week 1, gives different numbers and is not shown.
  • The holiday list covers 2025 onwards, so pages up to 2024 mark none. The dates come from the same registry as the "When is" pages, so the two cannot disagree.
  • Those are international, religious and US federal holidays; national public-holiday calendars of other countries are not included.
  • We do not publish a PDF version of this calendar — the page is meant to be read in the browser.

The 2026 calendar month by month

MonthDaysStarts onISO weeks
January 202631Thursday1–5
February 202628Sunday5–9
March 202631Sunday9–14
April 202630Wednesday14–18
May 202631Friday18–22
June 202630Monday23–27
July 202631Wednesday27–31
August 202631Saturday31–36
September 202630Tuesday36–40
October 202631Thursday40–44
November 202630Sunday44–49
December 202631Tuesday49–53

See Also

FAQ

How do I see the calendar for a specific month?

Choose the month and type the year above, then hit Show. You get that month drawn week by week, with the weekday of every date, and under the grid the number of days, the day-of-year span, the ISO weeks the month spans and the holidays that fall in it.

How do I get a whole year instead of one month?

Pick "Year" in the month list. The page then shows all twelve months of that year as compact grids, each one linking to its own month page.

Which week numbers does the calendar use?

ISO 8601 week numbers: week 1 is the week that contains the first Thursday of the year, and every ISO week runs Monday to Sunday. That is the numbering used in business and logistics across Europe; the US "week of the year" convention numbers weeks differently and is not shown here. This grid starts its rows on Sunday, so a row is not an ISO week: the ISO weeks a month spans are listed under its grid, and the Russian version, whose grid starts on Monday, shows them down the left.

Which day does the week start on?

On this English calendar the grid starts on Sunday, as it does on the Spanish and Portuguese versions — most of their readers are in Latin America, where the week is drawn from Sunday. The Russian version starts on Monday.