Time - Julian Day Number (JDN)

Julian Day Number (JDN) is numeric time representation that is defined as:

• the number of days
• since noon in Greenwich (UTC)
• on November 24,
• the first day of 4714 B.C.
• according to the proleptic Gregorian calendar.

To more recently, in Terrestrial Time which differs from UTC by a few seconds.

• Julian_day