Why is my time off by one hour?

Often DST or local timezone display differences. Unix time is UTC; convert to local only for UI.

Is my input in seconds or milliseconds?

10 digits = seconds; 13 digits = milliseconds. Convert by ×/÷ 1000 as needed.

How can I convert a date back to a Unix timestamp?

Use the reverse converter on this page: enter a date/time and copy the Unix timestamp output.

Convert Epoch Time to Date

Free online tool to convert Unix timestamp to human-readable date and time. Accurate, fast, and privacy‑friendly.

✓ 100% Free✓ No Registration✓ Privacy Safe

Client-sideprocessing for privacy

Multipleformats and timezones

ISO 8601& RFC 3339 outputs

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Instant Results

Convert in milliseconds, no waiting

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Developer-Friendly

Code examples for all languages

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100% Private

No data stored, all client-side

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Paste your Unix timestamp below to see instant conversion

Result will appear here...

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Unix Timestamp to Datetime

Convert epoch (seconds) to ISO 8601, RFC 3339, UTC, and local time. Includes code examples.

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Storing timestamps, timezones, DST, APIs, and performance tips for production systems.

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How it works

Learn the basics and best practices for converting epoch time (Unix timestamp) to readable datetime.

Unix time counts the seconds since January 1, 1970 (UTC). This number has no timezone by itself. When you paste a value into the converter, we detect whether it is seconds (10 digits) or milliseconds (13 digits), then render ISO 8601, RFC 3339, UTC and local outputs.

Tips: store timestamps in UTC on the server, display in the users local timezone in the UI, and prefer ISO 8601 for cross-system APIs.

Frequently asked questions

Why is my time off by one hour? Often DST/local timezone display differences. The timestamp itself is UTC.
10 vs 13 digits? 10 = seconds, 13 = milliseconds. Multiply/divide by 1000 when needed.
How to convert to timestamp? Enter a date/time and copy the numeric result from the converter.