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" Calculator
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 ISO 8601 week number down the left, weekends marked, and a dot on the days a holiday falls on. 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.
How to use it
- Choose the month in the list — or the "Year" value if you want the whole year.
- Type the year: the grid is built for any year from 1583 to 3000.
- Hit Calculate and read the grid: dates by weekday column, week numbers on the left, a dot on holidays, and the list of those holidays with their dates underneath.
What it is good for
- Planning deadlines — see which weekday a due date lands on before you set it on a Sunday.
- Working in week numbers — logistics, production schedules and contracts talk about "week 42" long before they talk about a date.
- Holidays and travel — you can see at a glance how a holiday sits against the weekend and where a long weekend appears.
- Period arithmetic — the day-of-year number is what you need to pro-rate interest, rent or a subscription.
- Movable feasts — Easter, Ramadan and Chinese New Year land on a different date every year.
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 2024 pages 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
| Month | Days | Starts on | ISO weeks |
|---|---|---|---|
| January 2026 | 31 | Thursday | 1–5 |
| February 2026 | 28 | Sunday | 5–9 |
| March 2026 | 31 | Sunday | 9–14 |
| April 2026 | 30 | Wednesday | 14–18 |
| May 2026 | 31 | Friday | 18–22 |
| June 2026 | 30 | Monday | 23–27 |
| July 2026 | 31 | Wednesday | 27–31 |
| August 2026 | 31 | Saturday | 31–36 |
| September 2026 | 30 | Tuesday | 36–40 |
| October 2026 | 31 | Thursday | 40–44 |
| November 2026 | 30 | Sunday | 44–49 |
| December 2026 | 31 | Tuesday | 49–53 |
See Also
- Date Calculator - Add to or Subtract Days/Weeks/Months or Years from Today
- Weeks and Days Ago From Today - Calculate what day was it Weeks and Days Ago From Today
- Days Between Two Dates - Calculate the Difference Between Two Dates. How many days, months, and years are between two dates? From date to date calculator
- Days until Date - How many days, weeks, months and years until a Date. How Many Days Until My Birthday? Countdown to date
About "Calendar by Month and Year" Calculator
This calendar lays the chosen month out week by week — weekdays, ISO 8601 week numbers, day-of-year numbers and the holidays that fall inside it. The "Year" option gathers all twelve months onto one page. For example, it can help you find out what does the August 2026 calendar look like? (The answer is: Saturday, August 1 – Monday, August 31). Pick the month (e.g. "August") and the year (e.g. "2026"), then hit the 'Calculate' button.
FAQ
How do I see the calendar for a specific month?
Choose the month and type the year above, then hit Calculate. You get that month drawn week by week, with the weekday of every date, the ISO week numbers down the left, the day-of-year span 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. Because this grid starts its rows on Sunday, a row spans two ISO weeks: it is labelled with the week its Monday belongs to, and the Sunday on its left edge still belongs to the week before.
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.