Temporal.PlainDateTime.prototype.dayOfYear

The dayOfYear accessor property of {{jsxref("Temporal.PlainDateTime")}} instances returns a positive integer representing the 1-based day index in the year of this date. The first day of this year is 1, and the last day is the {{jsxref("Temporal/PlainDateTime/daysInYear", "daysInYear")}}. It is calendar-dependent.

The set accessor of dayOfYear is undefined. You cannot change this property directly. To create a new Temporal.PlainDateTime object with the desired new dayOfYear value, use the {{jsxref("Temporal/PlainDateTime/add", "add()")}} or {{jsxref("Temporal/PlainDateTime/subtract", "subtract()")}} method with the appropriate number of days.

For general information and more examples, see {{jsxref("Temporal/PlainDate/dayOfYear", "Temporal.PlainDate.prototype.dayOfYear")}}.

Examples#

Using dayOfYear#

const dt = Temporal.PlainDateTime.from("2021-07-01");
console.log(dt.dayOfYear); // 182

Specifications#

{{Specifications}}

Browser compatibility#

{{Compat}}

See also#

• {{jsxref("Temporal.PlainDateTime")}}
• {{jsxref("Temporal/PlainDateTime/with", "Temporal.PlainDateTime.prototype.with()")}}
• {{jsxref("Temporal/PlainDateTime/add", "Temporal.PlainDateTime.prototype.add()")}}
• {{jsxref("Temporal/PlainDateTime/subtract", "Temporal.PlainDateTime.prototype.subtract()")}}
• {{jsxref("Temporal/PlainDateTime/year", "Temporal.PlainDateTime.prototype.year")}}
• {{jsxref("Temporal/PlainDateTime/day", "Temporal.PlainDateTime.prototype.day")}}
• {{jsxref("Temporal/PlainDateTime/dayOfWeek", "Temporal.PlainDateTime.prototype.dayOfWeek")}}
• {{jsxref("Temporal/PlainDateTime/daysInYear", "Temporal.PlainDateTime.prototype.daysInYear")}}
• {{jsxref("Temporal/PlainDate/dayOfYear", "Temporal.PlainDate.prototype.dayOfYear")}}