SquirrelMail supports ISO-8601 formated date in left_main.php since 1.4.3 and 1.5.1.
Clock format is controlled by separate option. If same option is used to control date format and 12/24 clock format, it would only add very similar selection options. Custom date formating options are not friendly to end users, that don't know php date() formating syntax and can be abused by setting option to some weird values. -- Tomas -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]

