# correspondance map between a month name and his number
use constant MONTH => { jan => 1,
			feb => 2,
			mar => 3,
			apr => 4,
			may => 5,
			jun => 6,
			jui => 7,
			aug => 8,
			sep => 9,
			oct => 10,
			nov => 11,
			dec => 12 };