cpp/chrono/year month weekday/operator days

Converts to a std representing the same date as this.

@1@ If :
 * If, returns a that represents the date 7 days prior to the first weekday of the year and month.
 * Else, returns a that represents the date  days after the first weekday of the year and month.

@@Otherwise, the returned value is unspecified.

@2@ Same as, but returns instead of. Equivalent to.