Today's day number in the year, and a lookup for any date.
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The day of the year counts from January 1 (day 1) to December 31 (day 365, or 366 in a leap year). It is also called the ordinal date and is handy for logs, scheduling and simple date maths. It is not the same as the astronomical Julian day number. In a leap year every date after February 28 is one day later in the count: March 1 is day 60 in a common year and day 61 in a leap year.
How many days are in a year? 365 in a common year, 366 in a leap year (divisible by 4, except centuries not divisible by 400).
What is the day number of December 31? 365, or 366 in a leap year.
How many days are left in the year? Shown in the boxes above, or see days left in the year.
More: Today's date · Week number · Days left in the year · Day of the week calculator · Days between dates · Days until Christmas · all date calculators