To call French phone numbers from outside France, use your international code then the country code for France (33). Do not use the leading (0). To call these numbers from within France, use the (0) at the beginning of the number. For example:
From the U.S. dial, 011 33 4 76 00 00 00
From within France, dial 04 76 00 00 00
France is one hour ahead of Greenwich Mean Time.
This means that without taking into consideration daylight savings/summer time, France is:
9 hours ahead of the U.S. west coast, 7 hours ahead of the mid-west, and 6 hours ahead of the east coast;
10 hours behind Australian Eastern Time, 9 hours behind Australian Central time, and 8 hours behind Australian Western time;
One hour behind South Africa.