Timestamp Converter

Convert Unix/Epoch timestamps to human-readable dates and vice versa.

Current Unix Timestamp

1/1/1970, 12:00:00 AM

Timestamp → Date

Date → Timestamp

What is Timestamp Converter?

If you've ever stared at '1709251200' in a database column and had to open a terminal just to figure out what date that is, this tool exists for you. The Timestamp Converter gives you instant, bidirectional translation between Unix/Epoch timestamps and human-readable dates. Paste a timestamp and get a formatted date; pick a date from the calendar and get the Unix value back. It handles both seconds-based timestamps (the 10-digit standard used by most backends, Unix systems, and APIs) and milliseconds-based timestamps (the 13-digit format JavaScript's Date.now() and many frontend frameworks produce). The live display at the top shows the current Unix timestamp ticking in real time, so you can grab a 'right now' value for testing without switching to a terminal. Under the hood, the tool uses JavaScript's Date object for conversion, which means it automatically adjusts for your local timezone as detected by your browser's Intl API — but it shows you the UTC equivalent too, so there's no ambiguity. Timezone bugs are some of the most maddening issues in software development, and having a quick visual sanity check for 'does this timestamp actually mean what I think it means?' saves real debugging time. Common use cases: decoding JWT expiration claims, making sense of API response timestamps, converting log file dates, building time-based query parameters, and debugging off-by-one timezone errors in production data. All processing happens in your browser, no server involved.

How to Use

To convert timestamp to date: Enter a Unix timestamp and click 'Convert'
To convert date to timestamp: Select a date and time, then click 'Convert'
Use the 'Current' buttons to quickly fill in the current time
Toggle between seconds and milliseconds for different timestamp formats

Common Use Cases

Debugging API responses with timestamp fields
Converting database timestamps to readable dates
Creating timestamps for API requests
Understanding log file timestamps
Working with JWT tokens and expiration times

Frequently Asked Questions

It's the number of seconds (or milliseconds) since midnight UTC on January 1, 1970 — the 'Unix epoch.' This single integer represents a point in time without any timezone ambiguity, which is why it's the standard for storing dates in databases, APIs, and log files. The number 1709251200, for example, is February 29, 2024 at midnight UTC.

Seconds-based timestamps are 10 digits (like 1709251200) and are the classic Unix format used by most backends and system clocks. Milliseconds-based timestamps are 13 digits (like 1709251200000) and are what JavaScript's Date.now() returns. If you paste a 13-digit number, the tool knows to treat it as milliseconds. This distinction trips people up constantly when debugging API responses.

The ticker at the top updates every second to show live Unix time. It's there so you can quickly grab the current timestamp for testing — useful when you need a 'right now' value for an API call, a database seed, or a JWT expiration calculation without opening a terminal.

The tool converts to your local timezone using your browser's built-in Intl API, and it labels the timezone in the output so there's no guessing. Unix timestamps themselves are always UTC-based, so the raw number is timezone-neutral — the conversion just makes it human-readable in your local context.

32-bit systems store Unix timestamps as signed 32-bit integers, which max out at 2,147,483,647 — that's January 19, 2038 at 03:14:07 UTC. After that, the value overflows and wraps to a negative number (i.e., a date in 1901). Modern 64-bit systems don't have this limit. This tool runs in your browser's JavaScript engine, which uses 64-bit floats, so it handles dates well past 2038 without issue.

Client-Side Sandbox Security Verification

Zero server transmission. All processing runs entirely within your browser's JavaScript sandbox using native browser-compiled APIs. 0% of your data payloads ever cross an external server boundary, origin log, or third-party endpoint.

Browser-native compilation. Operations like JSON.parse(), btoa()/atob(), encodeURIComponent(), and the Intl API are executed by the browser engine itself (V8, SpiderMonkey, or JavaScriptCore) — no WebAssembly payloads, no remote execution, no server-side eval.

Independently verifiable. Open your browser's DevTools > Network tab while using any tool. You will see zero outbound requests containing your data. This is a verifiable, auditable privacy architecture.