About UnixLi

What UnixLi is

UnixLi is a set of free, browser-based tools for developers who work with time: Unix timestamps, JWT expiration claims, timezones and Discord timestamps. There is no signup and no ads. The main tool on the homepage parses Unix seconds and milliseconds, ISO 8601 and RFC 2822 dates, and it also includes a timestamp diff calculator, a JWT decoder, a multi-timezone view, a relative time engine and copy-ready code snippets for 10 languages.

The tools run in your browser. Conversions and JWT decoding happen in JavaScript on your device, and the tool code does not upload what you paste. The privacy page explains exactly what the site loads and what it doesn’t.

Tools

• Unix Timestamp Converter — epoch ↔ date, with seconds and milliseconds auto-detected.
• JWT Decoder — decode a token’s header and payload and check the exp, iat and nbf claims.
• Discord Timestamp Generator — generate <t:unix:F> and :R style tags for Discord messages.
• Timestamp Difference Calculator — the exact duration between two timestamps, including business days.
• Timezone Converter — a live world clock for 13 zones that can also show a specific timestamp.
• JavaScript timestamps — Unix ↔ Date snippets.
• Python timestamps — datetime and timezone patterns.
• PHP timestamps — time() and DateTime.
• Go timestamps — time.Unix and locations.
• Rust timestamps — std::time and chrono.

Blog

The UnixLi blog has longer guides on the same topics:

• What is Epoch Time? Unix Timestamps Explained for Developers
• Unix Seconds vs Milliseconds: The Bug That Haunts Every Developer
• How to Convert Unix Timestamps in JavaScript — Complete Guide
• Convert Unix Timestamp to Date in Python — Complete Guide
• How to Decode and Check JWT Expiration Without a Library
• PostgreSQL Timestamps: TIMESTAMPTZ vs TIMESTAMP, Unix Epochs & Best Practices

Who builds UnixLi

UnixLi is built by Hassan Ben, who also writes the articles on the blog.

Product Hunt

UnixLi launched on Product Hunt. You can find it at producthunt.com/products/unixli.

Related pages