Unix Timestamp Converter
Convert between Unix timestamps (seconds or milliseconds since 1970-01-01 UTC) and human-readable dates. Includes ISO 8601, local time, and UTC formats.
Inputs
ISO 8601
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Unix seconds
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Unix milliseconds
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UTC
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Local time
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About Unix Timestamp Converter
What is a Unix timestamp?
The number of seconds since 1970-01-01 00:00:00 UTC (the "Unix epoch"), ignoring leap seconds. Widely used in databases, APIs, log files, and most programming languages.
Seconds vs milliseconds
Unix originally used seconds. JavaScript and many modern systems use milliseconds. A 10-digit number is seconds; 13 digits is milliseconds. Divide by 1,000 to convert.
Year 2038 problem
Signed 32-bit timestamps overflow on Jan 19, 2038 at 03:14:07 UTC. Modern systems use 64-bit timestamps, pushing this to ~292 billion years from now.