Template:Weekday before date

uses the optional date format string S (defaults to "F d, Y") to return the date of the first W (=Sunday, Monday, ..., Saturday) before the specified date with year Y, month M, and day of month D.

The first Sunday before August 28, 2024 is given by " " as "".

See also Template:Weekday after Julianday and Template:Weekday after date.