Calendar
Monthly and yearly calendar with ISO week numbers. Select any date to see its day of the year, week and more.
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About week numbers
Week numbers follow ISO 8601: weeks start on Monday and week 1 is the week containing the first Thursday of the year. Because of that, 1–3 January can belong to the last week of the previous year, and some years have 53 weeks.
Leap years have 366 days: every year divisible by 4, except century years not divisible by 400 (2000 was a leap year, 2100 will not be).
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