moment().isoWeekday(Number); moment().isoWeekday(); // Number

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Gets or sets the ISO day of the week with 1 being Monday and 7 being Sunday.

moment().isoWeekday(1); // Monday
moment().isoWeekday(7); // Sunday

A day name is also supported. This is parsed in the moment's current locale.

moment().isoWeekday("Sunday");
moment().isoWeekday("Monday");