Ambiakshi ToolsRuns 100% on this deviceDevelopersDateTimeUnixConvert a Unix timestamp
Unix timestamp to date, with auto-detected seconds/milliseconds, UTC and local time, and ISO 8601 output.
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Instant Unix Epoch & Timestamp Converter
Convert between Unix timestamps (seconds & milliseconds) and human-readable dates with automatic unit detection, side-by-side UTC and local timezone output, ISO 8601 formatting, and relative time offsets. Runs 100% on this device.
Converted Time Formats
Standard backend & POSIX format (10 digits)
JavaScript Date.now() format (13 digits)
Standard machine interchange format
Universal Coordinated Time
Rendered in client browser locale and offset
Time offset from the current moment
Local developer utility
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Frequently asked
Direct answers for search, answer engines, and generative crawlers.
Standard Unix epoch timestamps in seconds are 10 digits long (e.g., 1700000000 for November 2023). JavaScript timestamps in milliseconds are 13 digits long (e.g., 1700000000000). The engine applies a threshold heuristic of 30,000,000,000 (3×10¹⁰): any value below this threshold is parsed as seconds, and any value above is parsed as milliseconds.
Feedback, bugs & custom requests
Found a bug, a math anomaly, or a missing feature on Convert a Unix timestamp? Send it to engineering — reports land in our Discord channel. Optional email if you want a follow-up.
Related tools
Canonical: /developer/timestamp-converter. Estimates and conversions are educational. See the full disclaimer.