Date format setting - Sunbird Lightning Calendar
From MozillaZine Knowledge Base
How do I change the date format?
Mozilla applications use the operating system date format so that date formats are consistent across the screen.
To change your operating system date format, see: Configuring the date/time system settings on your computer.
See also Sunbird/Lightning 0.3 issue: Week view and Day view heading date format does not match system.
See also tip: Narrow date columns.