Temporal.PlainYearMonth.prototype.inLeapYear

The inLeapYear accessor property of {{jsxref("Temporal.PlainYearMonth")}} instances returns a boolean indicating whether this year-month is in a leap year. A leap year is a year that has more days (due to a leap day or leap month) than a common year. It is calendar-dependent.

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

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

Examples#

Using inLeapYear#

const ym = Temporal.PlainYearMonth.from("2021-07");
console.log(ym.inLeapYear); // false
console.log(ym.daysInYear); // 365
console.log(ym.monthsInYear); // 12

Specifications#

{{Specifications}}

Browser compatibility#

{{Compat}}

See also#

• {{jsxref("Temporal.PlainYearMonth")}}
• {{jsxref("Temporal/PlainYearMonth/with", "Temporal.PlainYearMonth.prototype.with()")}}
• {{jsxref("Temporal/PlainYearMonth/add", "Temporal.PlainYearMonth.prototype.add()")}}
• {{jsxref("Temporal/PlainYearMonth/subtract", "Temporal.PlainYearMonth.prototype.subtract()")}}
• {{jsxref("Temporal/PlainYearMonth/year", "Temporal.PlainYearMonth.prototype.year")}}
• {{jsxref("Temporal/PlainYearMonth/daysInYear", "Temporal.PlainYearMonth.prototype.daysInYear")}}
• {{jsxref("Temporal/PlainYearMonth/monthsInYear", "Temporal.PlainYearMonth.prototype.monthsInYear")}}
• {{jsxref("Temporal/PlainDate/inLeapYear", "Temporal.PlainDate.prototype.inLeapYear")}}