For dates in the Julian calendar, see Julian calendar. For the comic book character Julian Gregory Day, see Calendar Man.

For the artist and composer, see Julian Day (artist).

Almost 2.5 million days have transpired since this date.

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The Julian calendar has a leap year every fourth year, while the Gregorian calendar has a leap year every fourth year except century years not exactly divisible by 400.

This application assumes that the changeover from the Julian calendar to the Gregorian calendar occurred in October of 1582, according to the scheme instituted by Pope Gregory XIII.

This application deals with only two: the Gregorian calendar, now used universally for civil purposes, and the Julian calendar, its predecessor in the western world.

As used here, the two calendars have identical month names and number of days in each month, and differ only in the rule for leap years.

The ".3423000001348555" represented the time of day (" EST").

It is not certain whether the Julian date or day number system was named after Joseph Scaliger's father, Julius Caesar Scaliger, or after the Julian calendar. 2) Commonly in computer programming, Julian date has been corrupted to mean the number of elapsed days since the beginning of a particular year.

Calendar dates — year, month, and day — are more problematic.

Various calendar systems have been in use at different times and places around the world.

Typically, a 64-bit floating point (double precision) variable can represent an epoch expressed as a Julian date to about 1 millisecond precision.