The INTEGER-OF-DAY Function
The INTEGER-OF-DAY function converts a date in the Gregorian calendar from
Julian date form (YYYYDDD) to integer date form. The type of this function
is integer.
General Format

Arguments
- Argument-1 must be an integer of the form YYYYDDD, whose value is obtained
from the calculation:
(YYYY * 1000) + DDD.
- YYYY represents the year in the Gregorian calendar. It must be an integer
greater than 1600.
- DDD represents the day of the year. It must be a positive integer less than
367 provided that it is valid for the year specified.
Returned Values
- The returned value is an integer that is the number of days by which the
date represented by argument-1 succeeds December 31, 1600, in the Gregorian
calendar.