Months, week numbers and day counts

Use the month and year controls to reach a date, or switch to the year view for a broader overview. Weeks run from Monday to Sunday. Select a day in the month view to see its ISO week, day of year, quarter and days remaining in the year. This is a reference calendar; selecting a date does not create an appointment.

Day-of-year numbering starts at 1 on 1 January. For example, 1 February is day 32 in both common and leap years; dates after February differ by one day in a leap year. Use the date calculators when you need the distance between two dates rather than the position of a day within its year.

Every month is drawn as six rows of seven, which is enough for the longest arrangement a month can take, so the grid keeps the same height from January to December instead of jumping as you page through. The days filling the corners belong to the month before or after; they are printed in a lighter grey, they can still be selected, and they carry no holiday marker even when a holiday falls on them, because the markers are drawn for the month you are looking at.

The narrow column on the left gives the ISO week number for each row, taken from the Monday that starts it. A dot under a date means at least one holiday or observance falls there: accent-coloured for a federal holiday, amber for anything else. Hovering a marked day names what is on it, and the list beside the grid gives the same month in full, with each entry acting as a shortcut to that day. The year view swaps all of this for twelve small months at once, with holiday dates picked out in amber and today highlighted; clicking any of them opens that month in the main grid.

Take Saturday 4 July 2026. The panel beside the grid reports ISO week W27, day of year 185, quarter Q3, and 180 days left in the year, along with a line saying how far the day sits from today. Independence Day appears as an accent pill, and the same date carries an accent dot in the grid. The facts card underneath describes the month rather than the day: 31 days, Q3, not a leap year, week numbers running W27 to W31, a first day of Wednesday and 8 weekend days.

The trap in that example is the Saturday. Federal offices take the Friday before when a holiday lands on a Saturday, but the marker here stays on 4 July, because this calendar shows the date a holiday actually falls on rather than the day it is observed. The holidays page is where the weekend shift is worked out and both dates are printed side by side, so check there before assuming which day an office is shut.

ISO weeks start on Monday, and week 1 is the week containing 4 January. The ISO week year can differ from the calendar year at the start or end of December and January. For example, 1 January 2021 belongs to ISO week 53 of 2020. Include the week year when giving a schedule as a week number.

The same thing happens the other way round: Thursday 31 December 2026 and Friday 1 January 2027 both sit in ISO week 53 of 2026, so a plan for week 53 spans two calendar years and a plan for week 1 does not begin until 4 January. Note also that some years carry 53 numbered weeks rather than 52, so a week number carried over from last year's schedule does not point at the same stretch of the season this year.

Holiday markers cover US federal dates and selected religious and other observances. An observance is not necessarily a day off. Where an observed federal holiday differs from its calendar date, check the entry's label. State, school and employer calendars can differ, and this calendar is not a schedule of holidays for every country.

The leap-year line applies the full Gregorian rule rather than the quarter of it most people remember. A year divisible by four is a leap year, unless it is divisible by 100, unless it is also divisible by 400. So 2024 and 2000 have a 29 February and 1900 and 2100 do not, which is why the days-left figure for a date late in the year can differ by one between two years that look alike.

Day-of-year and days-left are counted in whole calendar dates rather than in elapsed hours. That matters in any country that moves its clocks, where one day of the year is 23 hours long and another is 25: counting hours would eventually drop or repeat a day, and counting dates never does. Holiday dates are not looked up in a table either. Each one is resolved from a rule for the year you are on, so a month in 2031 or 1994 is worked out the same way as this one, using the law as it stands rather than as it stood then.

All of that arithmetic runs in your browser, which is also why the page settles on the month you expect a fraction of a second after it appears. Until then it shows the month this version of the site was built in, named by its month and year rather than presented as the current one, and the Jump to today button returns you to the real current month at any point after that.