You can customize time and date formats on your site from [Website Management > Structure > Website Settings > Locale] under the Date/Time Presentation section.
You can choose a pre-configured setting from the drop-down menus, or choose custom within any of the date format fields to set your own configuration.
You can also select a geographic local and language setting from within [Website Management > Structure > Website Settings > Locale] under the Geography and Time Zone section using the drop-down menus. The language setting controls locale-specific presentation items such as time / date display and will present these elements on your site in the language you have chosen.
Note: Setting a language preference here does not translate any other aspect of your site into a foreign language and applies only to the date and time display.