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Unix Timestamp to Date
| UTC |
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| Your local timezone |
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What a Unix timestamp is
Most systems store Unix time as integer seconds since 1970-01-01 00:00:00 UTC (the POSIX epoch). This page maps that count to both UTC and your browser's local offset so you can decode API payloads, log lines, and JWT iat/exp claims. Leap seconds are typically absorbed by your OS—do not use this for legal sub-second astronomy without specialist libraries.
When to use it
Debugging curl responses, correlating CloudWatch rows with support tickets, or proving a cert's Not Before in human terms. Round-trip edits with Date to Unix Timestamp; pair conceptually with Seconds to Days when you only need duration, not calendar clocks.