The dayOfWeek accessor property of Temporal.PlainDateTime instances returns a positive integer representing the 1-based day index in the week of this date. Days in a week are numbered sequentially from 1 to daysInWeek, with each number mapping to its name. It is calendar-dependent.
The set accessor of dayOfWeek is undefined. You cannot change this property directly. To create a new Temporal.PlainDateTime object with the desired new dayOfWeek value, use the add() or subtract() method with the appropriate number of days.
For general information and more examples, see Temporal.PlainDate.prototype.dayOfWeek.
const dt = Temporal.PlainDateTime.from("2021-07-01");
console.log(dt.dayOfWeek); // 4; ThursdayTemporal.PlainDateTimeTemporal.PlainDateTime.prototype.with()Temporal.PlainDateTime.prototype.add()Temporal.PlainDateTime.prototype.subtract()Temporal.PlainDateTime.prototype.dayTemporal.PlainDateTime.prototype.dayOfYearTemporal.PlainDateTime.prototype.daysInWeekTemporal.PlainDateTime.prototype.weekOfYearTemporal.PlainDateTime.prototype.yearOfWeekTemporal.PlainDate.prototype.dayOfWeek