Temporal.PlainDate.prototype.daysInYear

The daysInYear accessor property of {{jsxref("Temporal.PlainDate")}} instances returns a positive integer representing the number of days in the year of this date. It is calendar-dependent.

For the ISO 8601 calendar, this is 365, or 366 in a leap year. In other calendar systems, it likely differs, especially in non-solar calendars.

The set accessor of daysInWeek is undefined. You cannot change this property directly.

Examples#

Using daysInYear#

const date = Temporal.PlainDate.from("2021-07-01");
console.log(date.daysInYear); // 365

const date2 = Temporal.PlainDate.from("2020-07-01");
console.log(date2.daysInYear); // 366; 2020 is a leap year

const date3 = Temporal.PlainDate.from("2021-07-01[u-ca=chinese]");
console.log(date3.daysInYear); // 354

const date4 = Temporal.PlainDate.from("2023-07-01[u-ca=chinese]");
console.log(date4.daysInYear); // 384; 2023 is a Chinese leap year

Specifications#

{{Specifications}}

Browser compatibility#

{{Compat}}

See also#

• {{jsxref("Temporal.PlainDate")}}
• {{jsxref("Temporal/PlainDate/with", "Temporal.PlainDate.prototype.with()")}}
• {{jsxref("Temporal/PlainDate/add", "Temporal.PlainDate.prototype.add()")}}
• {{jsxref("Temporal/PlainDate/subtract", "Temporal.PlainDate.prototype.subtract()")}}
• {{jsxref("Temporal/PlainDate/year", "Temporal.PlainDate.prototype.year")}}
• {{jsxref("Temporal/PlainDate/dayOfYear", "Temporal.PlainDate.prototype.dayOfYear")}}
• {{jsxref("Temporal/PlainDate/daysInMonth", "Temporal.PlainDate.prototype.daysInMonth")}}
• {{jsxref("Temporal/PlainDate/daysInWeek", "Temporal.PlainDate.prototype.daysInWeek")}}