Check JWT expiry values
Turn iat, exp, and nbf numbers into readable dates when debugging auth flows.
Current Time
Converter
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Unix Timestamp Converter
브라우저 내부 처리
Convert between Unix timestamps and human-readable dates.
Why timestamp conversion shows up so often
Interpret logs faster
Compare epoch values against both local time and UTC so incident timelines line up with alerts, dashboards, and user reports.
Review schedules safely
Move between seconds and milliseconds when checking campaigns, scheduled jobs, or delayed message sends.
Practical questions teams ask a lot
How do I tell seconds from milliseconds?
Ten digits usually means seconds and thirteen usually means milliseconds, but the safest check is always the source system documentation.
Why keep both local time and UTC?
Local time is easier for people, while UTC is the safer reference for systems, logs, and cross-region debugging.
Does the page send date values anywhere?
The conversion runs in the browser. You should still account for your own device, extensions, and operational security policies.
Working with timestamps
Tell seconds from milliseconds by digit count
A ten-digit Unix timestamp is seconds; thirteen digits is milliseconds. Reading milliseconds as seconds lands in the 1970s, and the reverse lands tens of thousands of years out. An absurd result usually means the wrong unit, not bad arithmetic.
Epoch values are always UTC
A Unix timestamp carries no time zone. The same number displays as 18:00 in Seoul and 09:00 in London. When comparing logs from servers with different display zones, one event appears at two different times.
The 2038 problem has not gone away
Systems storing seconds in a signed 32-bit integer overflow in January 2038. It still turns up in older embedded devices and legacy database columns. If you handle expiry or future dates, check the column type.