Unix Timestamp Converter Online – Free Epoch Converter
Convert any Unix timestamp to a human-readable date in seconds. Time Shuttle runs entirely in your browser, so your data stays private and never touches a server.
What Is a Unix Timestamp?
A Unix timestamp (also called epoch time) is the number of seconds that have elapsed since January 1, 1970, 00:00:00 UTC, not counting leap seconds. This starting point is known as the Unix epoch. Every second since then increments the timestamp by one — for example, the timestamp 1700000000 corresponds to November 14, 2023, at 22:13:20 UTC.
Unix timestamps are the universal language of computing. Operating systems, databases, programming languages, and APIs all use them to represent time in a timezone-independent, easily comparable format. When you see a timestamp in a database record, an API response, a log file, or an HTTP header, it is almost always a Unix timestamp.
The key advantage of Unix timestamps is their simplicity. They are just integers — no string parsing, no timezone ambiguity, no locale-dependent formatting. Two timestamps can be compared with a simple numeric comparison, making them ideal for sorting, filtering, and calculating time intervals.
Seconds vs. Milliseconds: How to Tell the Difference
Unix timestamps come in two common formats: seconds and milliseconds. A 10-digit timestamp is in seconds (the traditional format), while a 13-digit timestamp is in milliseconds (used by JavaScript and many modern APIs). For example, 1700000000 and 1700000000000 represent the exact same moment.
Time Shuttle automatically detects whether your input is in seconds or milliseconds based on the number of digits. If the timestamp has 10 or fewer digits, it is treated as seconds. If it has 11–13 digits, it is treated as milliseconds. This auto-detection eliminates the most common source of confusion when working with timestamps.
How to Use the Unix Timestamp Converter
- Open the tool: Navigate to the Unix Timestamp Converter on Time Shuttle. No installation or account creation is needed.
- Paste your timestamp: Enter the Unix timestamp in the input field. The tool accepts both seconds and milliseconds.
- View all formats: The converter instantly displays the same moment in every format — Unix (s), Unix (ms), ISO 8601, RFC 2822, UTC string, localized date, and relative time.
- Copy the result: Click the Copy button next to any format to save it to your clipboard.
Key Features
- Auto-detection: Automatically identifies whether your timestamp is in seconds or milliseconds.
- Multi-format output: See the same moment as Unix (s), Unix (ms), ISO 8601, RFC 2822, UTC, localized, and relative time.
- Timezone support: Convert between any IANA timezones using the browser's native Intl API.
- Client-side processing: All conversions happen in your browser. Your data never leaves your device.
- Unlimited usage: Convert as many timestamps as you want with no daily limits.
- No signup required: Start converting immediately without creating an account.
- Batch conversion: Paste multiple timestamps (one per line) and convert them all at once.
Common Use Cases
API debugging: When working with REST APIs, timestamps in responses need to be converted to human-readable dates for debugging. Time Shuttle makes this instant.
Log analysis: Server logs often record events as Unix timestamps. Converting them to local time helps you understand when events occurred.
Database records: Many databases store timestamps as Unix integers. Use Time Shuttle to quickly check what date a record represents.
JWT tokens: JWT payloads contain timestamps for issued-at (iat), expiration (exp), and not-before (nbf) claims. Decode and view them instantly.
Cache headers: HTTP cache headers like Expires and Last-Modified use timestamps. Time Shuttle helps you verify cache behavior.