Temporal.PlainTime.prototype.add()
Limited availability
This feature is not Baseline because it does not work in some of the most widely-used browsers.
The add() method of Temporal.PlainTime instances returns a new Temporal.PlainTime object representing this time moved forward by a given duration (in a form convertible by Temporal.Duration.from()), wrapping around the clock if necessary.
Syntax
add(duration)
Parameters
duration-
A string, an object, or a
Temporal.Durationinstance representing a duration to add to this time. It is converted to aTemporal.Durationobject using the same algorithm asTemporal.Duration.from().
Return value
A new Temporal.PlainTime object representing the time specified by the original PlainTime, plus the duration. Any units above hours are ignored, and if the time goes past midnight, it wraps around to the next day.
Adding a duration is equivalent to subtracting its negation.
Examples
Adding a duration
const start = Temporal.PlainTime.from("12:34:56");
const end = start.add({ hours: 1, minutes: 30 });
console.log(end.toString()); // 14:04:56
const end2 = start.add({ hours: -1, minutes: -30 });
console.log(end2.toString()); // 11:04:56
const distance = Temporal.PlainTime.from("00:00:00").until("01:23:45"); // 1h 23m 45s
const end3 = start.add(distance);
console.log(end3.toString()); // 13:58:41
Time wrapping
If the time goes past midnight, it wraps around to the next day:
const start = Temporal.PlainTime.from("12:34:56");
const end = start.add({ hours: 12 });
console.log(end.toString()); // 00:34:56
Specifications
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| Temporal # sec-temporal.plaintime.prototype.add |
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Legend
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- Full support
- Full support
- In development. Supported in a pre-release version.
- In development. Supported in a pre-release version.
- No support
- No support
- See implementation notes.