Temporal.PlainDateTime.prototype.weekOfYear

The weekOfYear accessor property of {{jsxref("Temporal.PlainDateTime")}} instances returns a positive integer representing the 1-based week index in the {{jsxref("Temporal/PlainDateTime/yearOfWeek", "yearOfWeek")}} of this date, or undefined if the calendar does not have a well-defined week system. The first week of the year is 1. It is calendar-dependent.

The set accessor of weekOfYear is undefined. You cannot change this property directly. To create a new Temporal.PlainDateTime object with the desired new weekOfYear value, use the {{jsxref("Temporal/PlainDateTime/add", "add()")}} or {{jsxref("Temporal/PlainDateTime/subtract", "subtract()")}} method with the appropriate number of weeks.

For general information and more examples, see {{jsxref("Temporal/PlainDate/weekOfYear", "Temporal.PlainDate.prototype.weekOfYear")}}.

Examples#

Using weekOfYear#

const dt = Temporal.PlainDateTime.from("2021-07-01");
console.log(dt.weekOfYear); // 26

Specifications#

{{Specifications}}

Browser compatibility#

{{Compat}}

See also#

• {{jsxref("Temporal.PlainDateTime")}}
• {{jsxref("Temporal/PlainDateTime/with", "Temporal.PlainDateTime.prototype.with()")}}
• {{jsxref("Temporal/PlainDateTime/add", "Temporal.PlainDateTime.prototype.add()")}}
• {{jsxref("Temporal/PlainDateTime/subtract", "Temporal.PlainDateTime.prototype.subtract()")}}
• {{jsxref("Temporal/PlainDateTime/yearOfWeek", "Temporal.PlainDateTime.prototype.yearOfWeek")}}
• {{jsxref("Temporal/PlainDateTime/dayOfWeek", "Temporal.PlainDateTime.prototype.dayOfWeek")}}
• {{jsxref("Temporal/PlainDateTime/daysInWeek", "Temporal.PlainDateTime.prototype.daysInWeek")}}
• {{jsxref("Temporal/PlainDateTime/daysInYear", "Temporal.PlainDateTime.prototype.daysInYear")}}
• {{jsxref("Temporal/PlainDate/weekOfYear", "Temporal.PlainDate.prototype.weekOfYear")}}