# Temporal.PlainTime — Instance methods

> {{jsxref("Temporal/PlainTime/add", "Temporal.PlainTime.prototype.add()")}} : Returns a new Temporal.PlainTime object representing this time moved forward by a given duration (in a form convertible by {{jsxref("Temporal/Duration/from", "Temporal.Duration.from()")}}), wrapping around the clock if nece

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- Canonical URL: <https://wikikv.com/k/ref-mdn-8dd28be8f18c551bb9c9>
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- Updated: `2026-08-16T09:32:14.508831+00:00`
- Tags: `reference-seed`, `mdn`, `web`, `javascript`, `reference`, `global-objects`, `temporal`, `plaintime`, `instance`, `methods`

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## Knowledge

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{{jsxref("Temporal/PlainTime/add", "Temporal.PlainTime.prototype.add()")}} : Returns a new Temporal.PlainTime object representing this time moved forward by a given duration (in a form convertible by {{jsxref("Temporal/Duration/from", "Temporal.Duration.from()")}}), wrapping around the clock if necessary. {{jsxref("Temporal/PlainTime/equals", "Temporal.PlainTime.prototype.equals()")}} : Returns true if this time is equivalent in value to another time (in a form convertible by {{jsxref("Temporal/PlainTime/from", "Temporal.PlainTime.from()")}}), and false otherwise. They are compared by their time values. Equivalent to Temporal.PlainTime.compare(this, other) === 0. {{jsxref("Temporal/PlainTime/round", "Temporal.PlainTime.prototype.round()")}} : Returns a new Temporal.PlainTime object representing this time rounded to the given unit. {{jsxref("Temporal/PlainTime/since", "Temporal.PlainTime.prototype.since()")}} : Returns a new {{jsxref("Temporal.Duration")}} object representing the duration from another time (in a form convertible by {{jsxref("Temporal/PlainTime/from", "Temporal.PlainTime.from()")}}) to this time. The duration is positive if the other time is before this time, and negative if after. {{jsxref("Temporal/PlainTime/subtract", "Temporal.PlainTime.prototype.subtract()")}} : Returns a new Temporal.PlainTime object representing this time moved backward by a given duration (in a form convertible by {{jsxref("Temporal/Duration/from", "Temporal.Duration.from()")}}), wrapping around the clock if necessary. {{jsxref("Temporal/PlainTime/toJSON", "Temporal.PlainTime.prototype.toJSON()")}} : Returns a string representing this time in the same RFC 9557 format as calling {{jsxref("Temporal/PlainTime/toString", "toString()")}}. Intended to be implicitly called by {{jsxref("JSON.stringify()")}}. {{jsxref("Temporal/PlainTime/toLocaleString", "Temporal.PlainTime.prototype.toLocaleString()")}} : Returns a string with a language-sensitive representation of this time. {{jsxref("Temporal/PlainTime/toString", "Temporal.PlainTime.prototype.toString()")}} : Returns a string representing this time in the RFC 9557 format. …

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