Temporal.PlainDateTime.prototype.withPlainTime()

The withPlainTime() method of {{jsxref("Temporal.PlainDateTime")}} instances returns a new Temporal.PlainDateTime object representing this date-time with the time part entirely replaced by the new time (in a form convertible by {{jsxref("Temporal/PlainTime/from", "Temporal.PlainTime.from()")}})

This method will replace all time properties, defaulting to 0 where properties are unspecified. If you only want to replace some of the time properties, use the {{jsxref("Temporal/PlainDateTime/with", "with()")}} method instead.

Syntax#

withPlainTime()
withPlainTime(plainTime)

Parameters#

• plainTime {{optional_inline}}
• : A string, an object, or a {{jsxref("Temporal.PlainTime")}} instance representing the new time. It is converted to a Temporal.PlainTime object using the same algorithm as {{jsxref("Temporal/PlainTime/from", "Temporal.PlainTime.from()")}}. If not specified, the time part is set to 00:00:00.

Return value#

A new Temporal.PlainDateTime object, with the date part copied from the original date-time and the time part replaced by the new time.

Examples#

Using withPlainTime()#

const dt = Temporal.PlainDateTime.from("2021-07-01T12:34:56");

// You can pass a string
const newDT = dt.withPlainTime("13:45:00");
console.log(newDT.toString()); // "2021-07-01T13:45:00"

// You can only specify some time properties, and the rest default to 0;
// for the with() method, they would be copied from the original date-time
const newDT2 = dt.withPlainTime({ hour: 13 });
console.log(newDT2.toString()); // "2021-07-01T13:00:00"

// You can pass nothing to set the time to midnight
const newDT3 = dt.withPlainTime();
console.log(newDT3.toString()); // "2021-07-01T00:00:00"

Specifications#

{{Specifications}}

Browser compatibility#

{{Compat}}

See also#

• {{jsxref("Temporal.PlainDateTime")}}
• {{jsxref("Temporal/PlainDateTime/with", "Temporal.PlainDateTime.prototype.with()")}}
• {{jsxref("Temporal/PlainDateTime/withCalendar", "Temporal.PlainDateTime.prototype.withCalendar()")}}
• {{jsxref("Temporal/PlainDateTime/toPlainTime", "Temporal.PlainDateTime.prototype.toPlainTime()")}}
• {{jsxref("Temporal/PlainDateTime/from", "Temporal.PlainDateTime.from()")}}