Unix Timestamp Converter

A Unix timestamp (also called epoch time, POSIX time, or Unix time) is the number of seconds elapsed since the Unix epoch, defined as midnight UTC on January 1, 1970. Because it is a single integer with no timezone or locale, it is the canonical format machines use to store moments in time — you'll find it in API responses, database columns, log lines, JWT claims, HTTP headers, and almost every programming language's standard library. Two flavors are common: seconds (10-digit) and milliseconds (13-digit, used by JavaScript's Date.now()). This converter accepts either, auto-detects the unit, and renders the date in ISO 8601, RFC 2822, and nine popular time zones. Pair it with the Age Calculator for date arithmetic or the JSON Formatterwhen you're inspecting timestamp fields in API payloads.