Weekday abbreviation identifiers or numbers (0=MO to 6=SU). Note: Numeric weekday values use 0 = MO (Monday) through 6 = SU (Sunday) per RFC 5545 / ISO 8601, distinct from JavaScript's Date.prototype.getDay() (where 0 is Sunday).
Date.prototype.getDay()
Weekday abbreviation identifiers or numbers (0=MO to 6=SU). Note: Numeric weekday values use 0 = MO (Monday) through 6 = SU (Sunday) per RFC 5545 / ISO 8601, distinct from JavaScript's
Date.prototype.getDay()(where 0 is Sunday).