Cldr.Calendar.Julian.day_of_year

You're seeing just the function day_of_year, go back to Cldr.Calendar.Julian module for more information.
Link to this function

day_of_year(year, month, day)

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Specs

day_of_year(year(), month(), day()) :: 1..366

Calculates the day of the year from the given year, month, and day.