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

Arguments
- Argument-1 is a positive integer that represents a number of days succeeding
December 31, 1600, in the Gregorian calendar.
Returned Values
- The returned value represents the Julian equivalent of the integer specified
in argument-1.
- The returned value is an integer of the form (YYYYDDD) where YYYY represents
a year in the Gregorian calendar and DDD represents the day of that year.