Timestamp Converter:
Unix, ISO 8601, UTC & local
Convert Unix timestamps and date strings into seconds, milliseconds, ISO 8601, local time, UTC, and relative time. All processing happens instantly in your browser.
Timestamp Converter
How it works
Paste your timestamp or date
Enter a Unix timestamp, an ISO 8601 string, or any human-readable date into the input field. The tool accepts seconds, milliseconds, and standard date formats.
View all formats instantly
The tool automatically converts your input and displays Unix seconds, Unix milliseconds, ISO 8601, local time, UTC time, and relative time in real time.
Copy or compare results
Use the output values in your code, API calls, database queries, or debugging sessions. Click "Now" to reset to the current time, or "Clear" to start over.
Frequently asked questions
What is the Best Answer Hub Timestamp Converter?
The Best Answer Hub Timestamp Converter is a free browser-based tool that converts Unix timestamps, ISO 8601 strings, and human-readable dates into multiple formats instantly. It displays Unix seconds, Unix milliseconds, ISO 8601, local time, UTC time, and relative time. Everything runs locally in your browser — no data is uploaded.
Is the Timestamp Converter free and safe?
Yes, it is completely free with no usage limits and no signup required. It is safe because all conversions happen locally inside your browser using native JavaScript Date methods. Your timestamp data is never sent to a server, stored in a database, or logged anywhere. You can verify this by disconnecting from the internet after loading the page.
What is a Unix timestamp?
A Unix timestamp is a way to represent a specific point in time as a single integer — the number of seconds that have elapsed since the Unix epoch at midnight UTC on January 1, 1970. It is the standard time format used in Linux systems, MySQL databases, PHP applications, and API responses from platforms like Stripe and GitHub.
How do I convert a Unix timestamp to a readable date?
Paste the Unix timestamp into the input field and the tool instantly converts it to a human-readable date. It automatically detects whether your value is in seconds or milliseconds and displays the result in ISO 8601, your local timezone, and UTC. No configuration or manual calculation is needed.
What date formats does this tool output?
The tool outputs six formats simultaneously: Unix timestamp in seconds, Unix timestamp in milliseconds, ISO 8601 string like 2026-05-19T12:00:00.000Z, your local system time, UTC time in RFC 7231 format, and a relative expression like "2 days" or "5 minutes". This covers every common developer and debugging need.
Can I convert a human-readable date to a Unix timestamp?
Yes. Paste any human-readable date string — such as "May 19, 2026" or "2026-05-19T12:00:00Z" — into the input field and the tool instantly calculates the corresponding Unix timestamp in both seconds and milliseconds. It uses the JavaScript Date parser, which understands formats from RFC 2822, ISO 8601, and most locale conventions.
What is the difference between seconds and milliseconds?
A Unix timestamp in seconds counts the number of whole seconds since the epoch. A timestamp in milliseconds counts the number of whole milliseconds, which is simply the seconds value multiplied by one thousand. Most modern APIs and JavaScript's Date.now() return milliseconds, while legacy systems, Linux commands like date +%s, and PHP's time() function use seconds.
Can I use the Timestamp Converter offline?
Yes. After you load the page once, the Timestamp Converter works without an internet connection. It is built entirely with vanilla JavaScript and uses only browser-native Date APIs. There are no external library downloads, no CDN dependencies, and no server-side processing. This makes it ideal for working in restricted or air-gapped environments.
What is ISO 8601 format?
ISO 8601 is an international standard for representing dates and times as text. The format looks like 2026-05-19T12:00:00.000Z, where the T separates the date from the time and the Z indicates UTC. It is the default format used by JavaScript's toISOString(), JSON APIs, MongoDB, PostgreSQL, and cloud platforms like AWS and Azure.
How does the relative time feature work?
The relative time feature compares the converted date to the current moment and shows a human-readable difference like "3 hours" or "2 months". It calculates the offset in milliseconds between the input date and now, then rounds to the nearest second, minute, hour, day, month, or year. If the date is in the past, the value is shown without a sign; future dates display a leading minus.
What is the Unix epoch?
The Unix epoch is the reference point from which Unix timestamps are counted: midnight UTC on January 1, 1970. A Unix timestamp of zero represents exactly that moment. The epoch was chosen by the original Unix developers at Bell Labs because it was a convenient, pre-existing date that predated most computer systems and avoided negative numbers for early dates.
Is my timestamp data sent to a server?
No. Your timestamp input never leaves your browser. The converter uses only client-side JavaScript to parse and format dates. There are no network requests, no analytics pings containing your data, and no cloud processing. You can verify this by opening your browser's Network tab in Developer Tools — you will see zero outgoing requests when you convert timestamps.
Why does my timestamp show a date in 1970 or 2050?
A date in 1970 usually means your timestamp is very small, possibly interpreted as milliseconds when it should be seconds. A date in 2050 suggests a value that is too large, possibly seconds when it should be milliseconds. The tool auto-detects the scale for values over 9999999999, but for smaller values it assumes seconds. Double-check your input unit if the result looks unexpected.
How does this compare to epochconverter.com?
EpochConverter.com is a popular timestamp utility, but Best Answer Hub's tool offers a cleaner interface, instant conversion without page reloads, and outputs six formats simultaneously instead of one at a time. It also works offline, requires no ads, and integrates seamlessly with our Developer Toolbox alongside Base64, JWT, and JSON utilities.