# Temporal.PlainYearMonth.from() — Parameters

> info : One of the following: A {{jsxref("Temporal.PlainYearMonth")}} instance, which creates a copy of the instance.

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## Metadata

- Canonical URL: <https://wikikv.com/k/ref-mdn-b1b714e6a3ce928f512c>
- Knowledge kind: `reference`
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- Updated: `2026-08-16T09:32:13.751640+00:00`
- Tags: `reference-seed`, `mdn`, `web`, `javascript`, `reference`, `global-objects`, `temporal`, `plainyearmonth`, `from`, `parameters`

## Provenance

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## Knowledge

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info : One of the following: A {{jsxref("Temporal.PlainYearMonth")}} instance, which creates a copy of the instance. An RFC 9557 string containing a date and optionally a calendar. If the calendar is not iso8601, a day is required. An object containing the following properties (in the order they are retrieved and validated): calendar {{optional_inline}} : A string that corresponds to the {{jsxref("Temporal/PlainYearMonth/calendarId", "calendarId")}} property. See Intl.supportedValuesOf() for a list of commonly supported calendar types. Defaults to "iso8601". All other properties are interpreted in this calendar system (unlike the {{jsxref("Temporal/PlainYearMonth/PlainYearMonth", "Temporal.PlainYearMonth()")}} constructor, which interprets the values in the ISO calendar system). era and eraYear : A string and an integer that correspond to the {{jsxref("Temporal/PlainYearMonth/era", "era")}} and {{jsxref("Temporal/PlainYearMonth/eraYear", "eraYear")}} properties. Are only used if the calendar system has eras. era and eraYear must be provided simultaneously. If they are not provided, then year must be provided. If all of era, eraYear, and year are provided, they must be consistent. month : Corresponds to the {{jsxref("Temporal/PlainYearMonth/month", "month")}} property. Must be positive regardless of the overflow option. monthCode : Corresponds to the {{jsxref("Temporal/PlainYearMonth/monthCode", "monthCode")}} property. If it is not provided, then month must be provided. If both month and monthCode are provided, they must be consistent. year : Corresponds to the {{jsxref("Temporal/PlainYearMonth/year", "year")}} property.

options {{optional_inline}} : An object containing the following property: overflow {{optional_inline}} : A string specifying the behavior when a date component is out of range (when using the object info). Possible values are: "constrain" (default) : The date component is clamped to the valid range. "reject" : A {{jsxref("RangeError")}} is thrown if the date component is out of range.

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