|Format||Optional. Format to use for the return value. See More Info for details. Defaults to %A, which is Sunday, Monday, etc.|
clockcommand for more details on the possible formats.
The options are, in brief:
%a : Mon, Tue, etc.
%A: Monday, Tuesday, etc. (This is the default.)
%u: Numbers: 1 = Monday, 2 = Tuesday, ..., 7 = Sunday
%w: Numbers: 0 = Sunday, 1 = Monday, ..., 6 = Saturday