DEV3 Free Unix Timestamp Converter — Source Code (React + Tailwind)

Source code of the DEV3 Unix Timestamp Converter, a Unix timestamp converter that reads seconds, milliseconds, microseconds, nanoseconds or date strings, shows any time zone, ISO and relative time, and converts local dates back.

Free download: sign in to any DEV3 account and click Download ZIP. Try it live: https://dev3.tech/tools/unix-timestamp-converter shows the finished tool running.

What is in the download

• A standalone Vite + React + TypeScript + Tailwind CSS project: src/tool holds the tool, shared pieces sit beside it
• package.json with exact versions plus a lockfile, so npm ci works
• README.md (run, build, embed in Next.js or plain React) and an MIT LICENSE

What the code does

• Unit auto-detection by digit count with a manual override
• Time zone output using Intl (full IANA list)
• Wall-clock to epoch conversion that respects daylight saving
• Relative time via Intl.RelativeTimeFormat

Tech stack

React 19, TypeScript, Vite, Tailwind CSS 4.

Install and customise

The How to install and How to use tabs list the steps. In short: unzip, npm ci, npm run dev, then copy the tool folder into your own app if you want to embed it.

Good to know

• A browser-only tool: there is no backend or database in the code.