Returns the number of days since noon in Greenwich on November 24, 4714 B.C, in the format DDDD.DDDD. For date and time calculation, the juliandate function is the best choice.
string uJuliandate([modifiers])
uJuliandate("now") // returns current date in the form "DDDD.DDDD"
uJuliandate('now')*86400 - uJuliandate('2004-01-01 02:34:56')*86400
uJuliandate(1092941466, 'unixepoch', 'localtime')