Unix Timestamp Converter
Use this free Unix Timestamp Converter to quickly get accurate results in seconds, free and instantly offline with no signup required ever, trusted by professionals in Austin, Chicago, Miami, Denver, Seattle, and New York for reliable daily use without accounts, subscriptions, limits, or delays on any device for everyday personal and business workflows daily.
Convert Unix timestamps to human-readable dates and back using this free unix timestamp converter, supporting seconds and milliseconds.
Calculator Inputs
About Unix Timestamp
Use this free Unix Timestamp Converter to quickly get accurate results in seconds, free and instantly offline with no signup required ever, trusted by professionals in Austin, Chicago, Miami, Denver, Seattle, and New York for reliable daily use without accounts, subscriptions, limits, or delays on any device for everyday personal and business workflows daily.
Unix Timestamp Converter: A Unix timestamp is the number of seconds (or milliseconds) that have elapsed since 01/01/1970 00:00:00 UTC, commonly called the Unix epoch. This free tool converts those numeric values into human-readable dates and back again instantly offline with no signup required ever, supporting both seconds and milliseconds.
How It Works: Choose whether you are converting a timestamp to a date or a date to a timestamp. Enter your value and the tool computes the result in your local time zone. The standard Unix epoch uses seconds — JavaScript and many APIs use milliseconds, which are 1,000 times larger. A 10-digit number is seconds; a 13-digit number is milliseconds.
Seconds vs. Milliseconds: When working with server logs you will typically see seconds-based timestamps like 1700000000. Browser-based JavaScript code produces millisecond values like 1700000000000. The tool auto-detects which format you are using based on digit count, or you can select the unit manually for precision.
Time Zone Handling: The converted date is displayed in your browser's local time zone. The timestamp itself is always relative to UTC, so the same Unix value can show different local times depending on where you are. This is critical when comparing timestamps across teams in different US cities.
Privacy and Security: Every conversion runs entirely in your browser using pure JavaScript math. Nothing is sent to any server, no cookies are set, and no data is stored. You can safely use this tool with sensitive timestamps from production systems.
Common Use Cases: Debugging API responses, converting database epoch columns, verifying JWT expiry claims, checking webhook delivery times, and auditing log files. Whether you are a developer, analyst, or system administrator, this free converter handles all your Unix timestamp needs in seconds.
Where it is used
A developer in Austin debugging a database log converts epoch 1700000000 to a readable date in seconds. A Chicago analyst pastes a 13-digit millisecond stamp from a JS API into a spreadsheet. A Miami startup team verifies webhook timestamps against their server logs. A Denver sysadmin converts a cron-generated Unix value to schedule a deploy at 03/15/2026 09:00 AM. A Seattle DevOps engineer checks token expiry times from a CI pipeline. A New York fintech auditor converts trade execution timestamps into human-readable format for compliance reports worth $2.5 million.
How to use the Unix Timestamp
- Direction — enter the value.
- Timestamp or date — enter the value (e.g. e.g. 1700000000 or 2023-11-14 22:13).
- Timestamp unit — enter the value.
- Calculate — press the Calculate button to see the result instantly above.
Examples
Epoch to date
Date to epoch
Milliseconds
Frequently Asked Questions
- What is the difference between seconds and milliseconds?
- Seconds is the standard Unix epoch unit used by most servers and databases. JavaScript timestamps and many APIs use milliseconds, which are 1,000 times larger. A 10-digit number is typically seconds; a 13-digit number is milliseconds.
- What time zone does the result use?
- The human-readable date is shown in your local time zone. The timestamp itself is always relative to UTC, so the same timestamp can display different local times for users in Austin versus Seattle.
- Is this tool free to use?
- Yes, this Unix timestamp converter is completely free with no limits. Convert unlimited timestamps instantly offline with no signup required ever.
- Does it work offline?
- Yes. All conversions happen in your browser using pure JavaScript math. No network requests are made, so you can use it offline or on secure internal networks.
- Can I convert dates before 1970?
- Technically yes — the tool handles negative timestamps for dates before 01/01/1970. However, many systems do not support pre-epoch dates, so verify compatibility with your target platform.
- Why is my timestamp showing the wrong date?
- Check whether your input is in seconds or milliseconds. A 13-digit number interpreted as seconds would show a date far in the future. Use the unit selector to match your data source.