The Temporal.PlainDate object represents a calendar date (a date without a time or time zone); for example, an event on a calendar which happens during the whole day no matter which time zone it's happening in. It is fundamentally represented as an ISO 8601 calendar date, with year, month, and day fields, and an associated calendar system.

The language accessor property of Intl.Locale instances returns the language associated with this locale.

A double-ended iterator with the direction inverted.

The Temporal.PlainMonthDay object represents the month and day of a calendar date, without a year or time zone; for example, an event on a calendar that recurs every year and happens during the whole day. It is fundamentally represented as an ISO 8601 calendar date, with year, month, and day fields, and an associated calendar system. The year is used to disambiguate the month-day in non-ISO calendar systems.

The Intl.DateTimeFormat.supportedLocalesOf() static method returns an array containing those of the provided locales that are supported in date and time formatting without having to fall back to the runtime's default locale.

The __proto__ accessor property of Object instances exposes the [[Prototype]] (either an object or null) of this object.

Used to do value-to-value conversions while consuming the input value. It is the reciprocal of `Into`.

The toExponential() method of Number values returns a string representing this number in exponential notation.

The Number.isSafeInteger() static method determines whether the provided value is a number that is a safe integer.

The get() method of Map instances returns the value corresponding to the key in this Map, or undefined if there is none. Object values are returned as the same reference that was originally stored, not as a copy, so mutations to the returned object will be reflected anywhere that reference is held, including inside the Map.