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Convert a Unix timestamp to a readable date, or a date back to a timestamp, with four simultaneous views: your local time, UTC, ISO 8601, and relative time.
Convert between Unix timestamps and human-readable dates. Supports seconds and milliseconds. Auto-detects format.
The reason all four are shown together is that timestamp bugs are almost always a mismatch between two of them. A log line in UTC, a dashboard in local time, and an ISO string with an offset you did not notice add up to an incident timeline that does not line up. Seeing them side by side makes the offset obvious.
The other perennial trap is seconds versus milliseconds. Unix time is seconds; JavaScript's Date.now() is milliseconds. A timestamp that lands in 1970 means you passed seconds where milliseconds were expected; one that lands in the year 55000 means the reverse.