# Temporal.PlainDate — Instance methods

> {{jsxref("Temporal/PlainDate/add", "Temporal.PlainDate.prototype.add()")}} : Returns a new Temporal.PlainDate object representing this date moved forward by a given duration (in a form convertible by {{jsxref("Temporal/Duration/from", "Temporal.Duration.from()")}}).

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## Metadata

- Canonical URL: <https://wikikv.com/k/ref-mdn-dd365a9fee282bc2c5b2>
- Knowledge kind: `reference`
- Confidence: `0.72`
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- Updated: `2026-08-16T09:31:39.038289+00:00`
- Tags: `reference-seed`, `mdn`, `web`, `javascript`, `reference`, `global-objects`, `temporal`, `plaindate`, `instance`, `methods`

## Provenance

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## Knowledge

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{{jsxref("Temporal/PlainDate/add", "Temporal.PlainDate.prototype.add()")}} : Returns a new Temporal.PlainDate object representing this date moved forward by a given duration (in a form convertible by {{jsxref("Temporal/Duration/from", "Temporal.Duration.from()")}}). {{jsxref("Temporal/PlainDate/equals", "Temporal.PlainDate.prototype.equals()")}} : Returns true if this date is equivalent in value to another date (in a form convertible by {{jsxref("Temporal/PlainDate/from", "Temporal.PlainDate.from()")}}), and false otherwise. They are compared both by their date values and their calendars. {{jsxref("Temporal/PlainDate/since", "Temporal.PlainDate.prototype.since()")}} : Returns a new {{jsxref("Temporal.Duration")}} object representing the duration from another date (in a form convertible by {{jsxref("Temporal/PlainDate/from", "Temporal.PlainDate.from()")}}) to this date. The duration is positive if the other date is before this date, and negative if after. {{jsxref("Temporal/PlainDate/subtract", "Temporal.PlainDate.prototype.subtract()")}} : Returns a new Temporal.PlainDate object representing this date moved backward by a given duration (in a form convertible by {{jsxref("Temporal/Duration/from", "Temporal.Duration.from()")}}). {{jsxref("Temporal/PlainDate/toJSON", "Temporal.PlainDate.prototype.toJSON()")}} : Returns a string representing this date in the same RFC 9557 format as calling {{jsxref("Temporal/PlainDate/toString", "toString()")}}. Intended to be implicitly called by {{jsxref("JSON.stringify()")}}. {{jsxref("Temporal/PlainDate/toLocaleString", "Temporal.PlainDate.prototype.toLocaleString()")}} : Returns a string with a language-sensitive representation of this date. {{jsxref("Temporal/PlainDate/toPlainDateTime", "Temporal.PlainDate.prototype.toPlainDateTime()")}} : Returns a new {{jsxref("Temporal.PlainDateTime")}} object representing this date and a supplied time in the same calendar system. {{jsxref("Temporal/PlainDate/toPlainMonthDay", "Temporal.PlainDate.prototype.toPlainMonthDay()")}} : Returns a new {{jsxref("Temporal.PlainMonthDay")}} object representing the {{jsxref("Temporal/PlainDate/monthCode", "monthCode")}} and {{jsxref("Temporal/PlainDate/day", "day")}} of this date in the same calendar system. …

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