# Beste UI

> Beautiful, accessible blocks, pieces and components for shadcn/ui and Tailwind CSS, built for React and Next.js. Install one with the shadcn CLI and the code is yours to edit: no runtime dependency, nothing to upgrade.

Markdown rendition of https://ui.beste.co/tools/timestamp-converter. Every page on the site has one: add `.md` to any address, or send `Accept: text/markdown`.

Whole catalog for LLMs: https://ui.beste.co/llms.txt. Registry index: https://ui.beste.co/r/registry.json

---
[tools](/tools)/[time](/tools/category/time)

# Unix timestamp converter

Turn a Unix timestamp into ISO, UTC and your own time zone at once, or paste a date and read the epoch back. Seconds and milliseconds both.

Timestamp or date

A plain number is

SecondsMillis

Use current time

Nowreading the clock

## Questions

Seconds or milliseconds?+

Unix time is defined in seconds, and most backends store it that way, but JavaScript's Date.now returns milliseconds. A ten digit number is almost always seconds and a thirteen digit one milliseconds; the switch here decides how a plain number is read.

Can I paste a date instead of a number?+

Yes. Anything the browser can parse works in the same field, so an ISO string such as 2026-08-18T09:30:00Z gives you the epoch back, along with the UTC and local readings.

Which time zone is the local row?+

Your own, as the browser reports it. The ISO and UTC rows never move, which is what makes them the pair to quote in a bug report: a timestamp read in two time zones is how most scheduling bugs start.

What is the year 2038 problem?+

A signed 32-bit timestamp runs out on 19 January 2038, and rolls over to 1901\. Anything still storing seconds in an int is affected, which is mostly old C, embedded systems and a few database columns. A 64-bit integer fixes it, and most modern stacks already use one.

## Related tools

[JWT decoderPaste a JSON Web Token and read its header, payload and expiry. Decoding only, in your browser, with no secret asked for and nothing sent anywhere.](/tools/jwt-decoder)[UUID generatorGenerate UUID v4, time-sortable UUID v7 or Nano IDs in bulk, from your browser's own cryptographic random source.](/tools/uuid-generator)[Cron expression editorRead a cron expression in a sentence, see the next six times it fires in your own zone, and start from a preset if the fields are the part you never remember.](/tools/cron-expression)

Ship it · Ship it · Ship it · Ship it · Ship it · Ship it · Ship it · Ship it · Ship it · Ship it · Ship it · Ship it · Ship it · Ship it · Ship it · Ship it · 

## The tools are free. So is most of the library.

1935 blocks and 989 pieces for shadcn/ui and Tailwind, built on the same tokens these tools write. Install one with a command and the code is yours.

[Browse the blocksBrowse the blocks](/blocks)

No signup for the tools. MIT for free blocks, commercial licence for Pro.

## Ship the interface, keep the code.

New blocks, pieces and components every week. Install one with a command and it is yours to edit. No runtime dependency, no upgrade path to fight.

[Browse the libraryBrowse the library](/blocks)[See pricingSee pricing](/pricing)

### Library

* [Blocks](/blocks)
* [Pages](/pages)
* [Pieces](/pieces)
* [Components](/components)
* [Search](/search)

### Learn

* [Docs](/docs)
* [AI & MCP](/docs/mcp)
* [Blog](/blog)
* [Free tools](/tools)
* [What's new?](/changelog)
* [Website Builder](https://beste.co)

### More

* [Pricing](/pricing)
* [Referrals](/referrals)
* [License](/license)
* [GitHub](https://github.com/beste-co/beste-ui)

### Shadcn Blocks

* [Shadcn Hero Blocks](/blocks/hero)
* [Shadcn Feature Blocks](/blocks/feature)
* [Shadcn Pricing Blocks](/blocks/pricing)
* [Shadcn CTA Blocks](/blocks/cta)
* [Shadcn FAQ Blocks](/blocks/faq)
* [Shadcn About Blocks](/blocks/about)
* [Shadcn Stats Blocks](/blocks/stats)
* [Shadcn Footer Blocks](/blocks/footer)
* [Shadcn Navigation Blocks](/blocks/navigation)
* [Shadcn Auth Blocks](/blocks/auth)
* [Shadcn Ecommerce Blocks](/blocks/ecommerce)
* [Shadcn Portfolio Blocks](/blocks/portfolio)
* [Shadcn Showcase Blocks](/blocks/showcase)
* [Shadcn Careers Blocks](/blocks/careers)
* [Shadcn Onboarding Blocks](/blocks/onboarding)
* [Shadcn Coming Soon Blocks](/blocks/coming-soon)
* [Shadcn Post Blocks](/blocks/post)
* [Shadcn Legal Blocks](/blocks/legal)
* [Shadcn Workflow Blocks](/blocks/workflow)
* [Shadcn News Blocks](/blocks/news)

© 2026, [Beste](https://beste.co). All rights reserved.