ISO-8601 numeric representation of the day of the week 1 (for Monday) through 7 (for Sunday).
The other option can be taken from docs: http://docs.couchcms.com/tags-reference/date.html
It is not documented in couch, but works. This option was added later, after couch docs were produced. For all the fresh options visit http://php.net/manual/en/function.date.php<cms:date format='N' />
The other option can be taken from docs: http://docs.couchcms.com/tags-reference/date.html
<cms:date format='w' /> Numeric representation of the day of the week 0 (for Sunday) through 6 (for Saturday)