Linux format de l' heure

Bonjour,
je veut changer le format de l' heure et de la date pour faire fonctioner mon program je sais comment avec windows mais je ne sais pas avec linux le program a besoins de ceci
merci a l' avance sylvain de montreal
Your Date Format: The program requires that your date format is set to MM/DD/YYY. If your date is not set to this format, you will get an error when calculating races.
Your Time Format: PC's have two ways of showing time: 24 hour format or AM/PM. Both will work in the program but the display and printing of results will look much better if the 24 hour format is used. The AM/PM format tends to run into the next field owing to its length. To change go to Start\Settings\Control Panel\Regional Setting\Time. The time setting you must select or if not there, type in is: HH:mm:ss - The uppercase and small letters way of typing is important!