The Julian Date Converter is an OutSystems Client Action that supports astronomical Julian Dates (JD), Julian Day Numbers (JDN), four-digit ordinal dates (YYYYDDD), and two-digit ordinal dates (YYDDD).

It validates the input format, checks leap years and day-of-year values, handles YYDDD century conversion through a configurable YearBase, and returns the converted date in UTC ISO 8601 format. The action also provides a Boolean validation result and a descriptive error message for invalid inputs.

The component is suitable for legacy systems, scientific applications, manufacturing codes, aviation, logistics, and other scenarios where Julian-based date values need to be converted into standard dates.