(PHP 4, PHP 5, PHP 7)
jdtofrench — Converts a Julian Day Count to the French Republican Calendar
jdtofrench ( int $julian_day ) : string
Converts a Julian Day Count to the French Republican Calendar.
julianday
A julian day number as integer
The french revolution date as a string in the form "month/day/year"
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https://www.php.net/manual/en/function.jdtofrench.php