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(SQL*Plus User's Guide and Reference; search in this book)
The sequential day count reckoned consecutively beginning January 1, 4713 B.C.
The basis of time for astrodynamics. The number of days since 12:00 on 1 January 4713 B.C. The Julian Day for 1 January 2000 at noon is 2,451,545.0.
the interval of time in days and fraction of a day since 4713 B.C. January 1, Greenwich noon, Julian proleptic calendar. In precise work the timescale, e.g., dynamical time or universal time, should be specified.
A three-digit number indicating the day of the year. January 1 is 001 and December 31 is 365 or 366.
A number between 1 and 365 referring to a specific date of the year for either the packing date or expiration date of the beer.
The number of days since noon, Greenwich time, on January 1, 4713 BC. Noon on that day was Julian Day 0.00. At 6 pm on that date, it was Julian Day 0.25. At 6 pm on January 2, 4713 BC, it was Julian Day 1.25. Thus, the Julian Date specifies both the date and the time of day. As this entry was written, at 10:30 am PDT on October 7, 2003, the Julian Date was 2452920.22917. For a calculation of the current (or any other) Julian Date, use this external link.
the number of elapsed days since the beginning of a particular year. For example, in this usage, the Julian date for the calendar date of 1998-02-28 would be day 059.
a Julian day number with a fractional component representing the time elapsed since the start of the day (or rather the nychthemeron, the day-and-night)
a way of referring to a date and is an alternative to YYYYMMDD
A date written in the format yyddd, where yy = current year, ddd = day of year. 84001 = January 1, 1984, 85365 = December 31, 1985. (Numbers will vary if Leap Year)
A Julian Date (JD) is a floating-point number rounded to the nearest Julian Day with the fraction of the day which has passed since 12 noon Greenwich Mean Time (UT or TT) of that day. This should not be confused with the "Julian Calendar" or the "Julian Date." Julian Dates are commonly used to simplify astronomical calculations.
The interval of time in days (and fraction of a day) since Greenwich noon on Jan. 1, 4713 BC. The JD is always half a day off from Universal Time, because the current definition of JD was introduced when the astronomical day was defined to start at noon (prior to 1925) instead of midnight. Thus, 1995 Oct. 10.0 UT = JD 2450000.5.
An algorithm for expressing a date in integer form, using the SQL function JDATE. Julian dates allow additional arithmetic functions to be performed on dates.
The numeric day of the year that the return or document is numbered. The sixth, seventh, and eighth digits of the DLN represent the Julian date.
A date that is in the format of the year and the number of the day in the year where January 1st is day 1 and December 31st is day 365, unless the year is a leap year in which case December 31st is day 366. This is shown abstractly as dddyy (01596 is the 15th day of 1996) or as yyddd (96015).
A date calculated by number of days elapsed since January 1, 4713 BC.