Epoch Converter Convert epoch timestamps in seconds or milliseconds to human-readable dates with auto-detection.
Epoch Converter
Convert epoch timestamps in seconds or milliseconds to human-readable dates with auto-detection.
Enter Epoch
Paste or type an epoch timestamp value.
Use Auto-Detect
The tool auto-detects seconds vs milliseconds (or set manually).
View Results
See the date in local time, UTC, ISO 8601, and relative format.
What Is Epoch Converter?
The Epoch Converter translates epoch timestamps — the number of seconds or milliseconds since the Unix epoch (January 1, 1970 UTC) — into human-readable date formats. It features auto-detection that distinguishes between seconds (10-digit), milliseconds (13-digit), and microseconds (16-digit) timestamps based on magnitude. A live display shows the current epoch time in both seconds and milliseconds, updating every second. Results include local time, UTC, ISO 8601, epoch in both units, and relative time. Quick buttons let you insert the current timestamp instantly. This is a specialized companion to the Unix Timestamp Converter, focused on the epoch-to-date direction with enhanced detection features.
Why Use Epoch Converter?
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Smart auto-detection of timestamp unit (seconds, milliseconds, microseconds)
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Live current epoch display updating every second
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Multiple output formats with one-click copy
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Quick "Use Current" buttons for instant testing
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Handles timestamps from various systems and languages
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Zero-dependency, client-side processing
Common Use Cases
Log File Analysis
Decode epoch timestamps from application logs and monitoring systems.
API Response Parsing
Convert epoch values in API responses to readable dates.
Database Troubleshooting
Interpret epoch timestamp columns in databases.
Security Analysis
Decode timestamps in tokens, certificates, and authentication records.
Data Migration
Verify epoch-to-date conversions during system migrations.
Technical Guide
Auto-detection uses magnitude thresholds: values above 10^15 are treated as microseconds (divided by 1000), values above 10^12 as milliseconds, and all others as seconds (multiplied by 1000). The JavaScript Date constructor accepts milliseconds, so all inputs are normalized to milliseconds before conversion. The live current epoch uses a useEffect with setInterval(1000ms) updating a state variable. Relative time is computed by comparing the epoch to Date.now() and expressing the difference in the most appropriate unit. The copy functionality uses the navigator.clipboard API with a fallback for older browsers.
Tips & Best Practices
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1Most programming languages use seconds (10 digits), but JavaScript/Java use milliseconds (13 digits)
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2The auto-detect feature eliminates the guesswork — but you can disable it for manual control
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3If the date looks wrong, try toggling auto-detect — the timestamp might be in an unexpected unit
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4Use the live display to verify your system clock is accurate
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5Negative epoch values represent dates before January 1, 1970
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📅 Date & TimeFrequently Asked Questions
Q What is the difference between epoch and Unix timestamp?
Q How does auto-detection work?
Q Can I convert negative epoch values?
Q Why does the live display change every second?
Q What systems use epoch timestamps?
Q What is the Y2038 problem?
About This Tool
Epoch Converter is a free online tool by FreeToolkit.ai. All processing happens directly in your browser — your data never leaves your device. No registration or installation required.