This feature is not Baseline because it does not work in some of the most widely-used browsers.
Experimental: This is an experimental technology
Check the Browser compatibility table carefully before using this in production.
The daysInYear accessor property of Temporal.PlainYearMonth instances returns a positive integer representing the number of days in the year of this date. It is calendar-dependent.
The set accessor of daysInYear is undefined. You cannot change this property directly.
For general information and more examples, see Temporal.PlainDate.prototype.daysInYear.
const ym = Temporal.PlainYearMonth.from("2021-07");
console.log(ym.daysInYear); // 365
| Desktop | Mobile | Server | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chrome | Edge | Firefox | Opera | Safari | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | WebView Android | Deno | Node.js | |
daysInYear |
No | No | No | No | No | No | No | No | No | No | No | 1.40 | No |
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https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Temporal/PlainYearMonth/daysInYear