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Timestamp ↔ Date

Convert Unix timestamps in seconds or milliseconds to real calendar date-times, or vice versa.

Interactive Online Utility

Timestamp ↔ Date runs 100% locally in your browser sandbox with zero network roundtrips. Load or paste your code directly into the workspace above to format, parse, validate, or generate your output instantly. 

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DID YOU KNOW? Unix Time Ignores Leap Seconds

Unix time officially assumes every day has exactly 86,400 seconds. When UTC introduces a leap second, NTP servers use "leap smearing" to gradually spread the extra second over 24 hours to avoid stepping clock jumps.

Technical Guide & Overview

Timestamp ↔ Date is a dedicated developer utility designed to streamline common workflow tasks with zero installation, instant execution, and complete data privacy.

How It Works Under the Hood

The tool leverages modern browser standards (HTML5, WebAssembly, WebGL, and modern ECMAScript) to execute complex computations directly on your local device CPU and GPU without offloading processing to third-party cloud servers.

Authoritative Specifications & Primary Standards

Official specifications, RFCs, and authoritative open-source repositories for Timestamp ↔ Date:

IEEE Standard

Standard definition of Unix epoch seconds counting since 1970-01-01T00:00:00Z.

ISO Standard

International standard for numeric representation of dates and coordinated universal time.

Zero-Knowledge Client-Side Sandboxing

Privacy First: This tool operates completely inside your browser with zero remote logging or tracking.