Unix Timestamp Converter

Converts between Unix timestamps (seconds or milliseconds since January 1, 1970 UTC) and human-readable dates in either direction. Unix timestamps show up constantly in logs, API responses, database fields, and JWT expiration claims, and converting one by hand involves error-prone arithmetic, particularly around timezone handling and the seconds-vs-milliseconds ambiguity that trips up a lot of API integrations. Useful for quickly checking what an unfamiliar timestamp in a log line actually corresponds to.

Classic 32-bit Unix time overflows in January 2038 — worth knowing ahead of time if you're working with an older system or a fixed-width integer field storing timestamps, rather than after it silently wraps to a garbage date.

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