Temporal.PlainDate.prototype.with()

info

An object containing at least one of the properties recognized by Temporal.PlainDate.from() (except calendar): day, era and eraYear, month, monthCode, year. Unspecified properties use the values from the original date. You only need to provide one of month or monthCode, and one of era and eraYear or year, and the other will be updated accordingly.

options Optional

An object containing the following property:

overflow Optional

A string specifying the behavior when a date component is out of range. Possible values are:

"constrain" (default)

The date component is clamped to the valid range.

"reject"

A RangeError is thrown if the date component is out of range.

A new Temporal.PlainDate object, where the fields specified in info that are not undefined are replaced by the corresponding values, and the rest of the fields are copied from the original date.

TypeError

Thrown in one of the following cases:

• info is not an object.
• options is not an object or undefined.

RangeError

Thrown in one of the following cases:

• The provided properties that specify the same component are inconsistent.
• The provided non-numerical properties are not valid; for example, if monthCode is never a valid month code in this calendar.
• The provided numerical properties are out of range, and options.overflow is set to "reject".
• The result is not in the representable range, which is ±(10⁸ + 1) days, or about ±273,972.6 years, from the Unix epoch.

const date = Temporal.PlainDate.from("2021-07-06");
const newDate = date.with({ day: date.daysInMonth });
console.log(newDate.toString()); // 2021-07-31
const nextDecade = date.with({ year: date.year + 10 });
console.log(nextDecade.toString()); // 2031-07-06

For more examples, see the documentation for the individual properties that can be set using with().

• Temporal.PlainDate
• Temporal.PlainDate.prototype.withCalendar()
• Temporal.PlainDate.from()
• Temporal.PlainDate.prototype.add()
• Temporal.PlainDate.prototype.subtract()