The day accessor property of Temporal.PlainDateTime instances returns a positive integer representing the 1-based day index in the month of this date, which is the same day number you would see on a calendar. It is calendar-dependent.

The set accessor of day is undefined. You cannot change this property directly. Use the with() method to create a new Temporal.PlainDateTime object with the desired new value.

For general information and more examples, see Temporal.PlainDate.prototype.day.

Examples

Using day

const dt = Temporal.PlainDateTime.from("2021-07-01"); // ISO 8601 calendar
console.log(dt.day); // 1

Specifications

Browser compatibility

See also

• Temporal.PlainDateTime
• Temporal.PlainDateTime.prototype.with()
• Temporal.PlainDateTime.prototype.add()
• Temporal.PlainDateTime.prototype.subtract()
• Temporal.PlainDateTime.prototype.year
• Temporal.PlainDateTime.prototype.month
• Temporal.PlainDateTime.prototype.daysInMonth
• Temporal.PlainDateTime.prototype.dayOfWeek
• Temporal.PlainDateTime.prototype.dayOfYear
• Temporal.PlainDate.prototype.day