When it is 12:00 PM (Noon) in New York City (Eastern Time), it is 6:00 PM (18:00) in Paris, France (Central European Time).
Because both regions observe Daylight Saving Time (though on slightly different schedules), the difference is almost always 6 hours. For a few weeks in March and October/November, it can briefly be 5 hours.
Example: A 9:00 AM ET conference call is 3:00 PM in Paris.