---
title: temporal-polyfill
---

The [temporal-polyfill](https://www.npmjs.com/package/temporal-polyfill) package is now a peer dependency of all the FullCalendar packages. This means you are required to install it.

The "Temporal" [built-in browser API](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Temporal) is coming to all modern browsers, and this package is a polyfill for it, which means it allows you to use it before it's officially supported.

FullCalendar **DOES NOT INSTALL IT GLOBALLY** but instead uses it internally. For v7, FullCalendar uses the [tree-shakeable API](https://github.com/fullcalendar/temporal-polyfill?tab=readme-ov-file#tree-shakable-api), meaning the code-size impact will be minimal and there will be no side-effects.

Though FullCalendar does not install the polyfill globally, you are welcome to do so for your projects:

```ts
import 'temporal-polyfill/global'
```