>>-JULIAN_DAY--(--expression--)--------------------------------><
The schema is SYSFUN.
Returns an integer value representing the number of days from January 1,4712 B.C. (the start of Julian date calendar) to the date value specified in the argument.
The argument must be a date, timestamp, or a valid character string representation of a date or timestamp that is neither a CLOB nor a LONG VARCHAR.
The result of the function is INTEGER. The result can be null; if the argument is null, the result is the null value.