The DAY-OF-INTEGER function converts a date in the Gregorian calendar from integer date form to Julian date form (YYYYDDD).
The function type is integer.
The function result is a seven-digit integer.
The returned value represents the Julian equivalent of the integer specified as 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.