Dayjs is a 2kB JavaScript date utility library.

Is Dayjs open source?

Yes. Dayjs is open source under the MIT licence. Its source code is on GitHub at iamkun/dayjs and is written mainly in JavaScript.

Yes. Dayjs is open source, so the software itself is free to use.

Can I self-host Dayjs?

Yes. Dayjs can be self-hosted on your own server or infrastructure.

Is Dayjs actively maintained?

Yes. The most recent commit to Dayjs was on 15 September 2026, and the latest release is v1.11.23, published on 17 August 2026. The project has 49k stars on GitHub.

Dayjs

Open source

2kB JavaScript date utility library

Visit Dayjs View on GitHub Claim listing

GitHub stars: 49k
Last 30 days: +—
Last commit: 21 days ago
Repository age: 8 years
Version: v1.11.23
Licence: MIT
Self-hosted: Yes

About Dayjs

2kB JavaScript date utility library

Built with: JavaScript tools
Tags: time; date; date-formatting; datetime; moment; dayjs

Dayjs: questions and answers

What is Dayjs?: Dayjs is a 2kB JavaScript date utility library.
Is Dayjs open source?: Yes. Dayjs is open source under the MIT licence. Its source code is on GitHub at iamkun/dayjs and is written mainly in JavaScript.
Is Dayjs free?: Yes. Dayjs is open source, so the software itself is free to use.
Can I self-host Dayjs?: Yes. Dayjs can be self-hosted on your own server or infrastructure.
Is Dayjs actively maintained?: Yes. The most recent commit to Dayjs was on 15 September 2026, and the latest release is v1.11.23, published on 17 August 2026. The project has 49k stars on GitHub.