Unix Timestamp Converter Online Free
Convert any Unix timestamp to a human-readable date, or convert any date back to a Unix timestamp. Supports seconds and milliseconds, with live current timestamp.
How This Unix Timestamp Converter Online Free Works
This Unix timestamp converter online free translates between epoch time and human-readable dates in both directions. Paste a timestamp and get the UTC string, ISO 8601, local time, and a relative label like “3 days ago”. Pick a date and get back the timestamp in both seconds and milliseconds.
Unix time counts the seconds elapsed since January 1, 1970 at 00:00:00 UTC, known as the Unix epoch. It is the standard time representation in most programming languages, databases, APIs, and log files because it is a single integer with no timezone ambiguity.
The tool auto-detects whether your input is in seconds (10 digits) or milliseconds (13 digits), so you do not need to know upfront. A live ticking current timestamp is always visible at the top, ready to copy.
| Format | Example |
|---|---|
| Unix seconds | 1718438400 |
| Unix milliseconds | 1718438400000 |
| ISO 8601 (UTC) | 2024-06-15T08:00:00.000Z |
| UTC string | Sat, 15 Jun 2024 08:00:00 GMT |
| Local time | 15/06/2024, 10:00:00 |
What this tool does
How to use it
Choose a direction
Pick “Timestamp to Date” if you have an epoch value to decode. Pick “Date to Timestamp” to generate an epoch value from a human date.
Enter your value
Paste the timestamp or select the date and time. Results appear instantly below without needing to click anything.
Check the unit
If converting a timestamp, confirm whether it is in seconds or milliseconds. The tool auto-detects based on digit count but you can override it.
Copy what you need
Each output row has a copy button. Use the live timestamp at the top to grab the current epoch time at any moment.
Questions About Unix Timestamp Converter Online Free
A Unix timestamp is the number of seconds that have passed since January 1, 1970 at 00:00:00 UTC, which is called the Unix epoch. It is timezone-neutral, always increasing, and represented as a single integer, which makes it the standard way to store and compare dates in programming, databases, APIs, and server logs. For example, the timestamp 1718438400 represents June 15, 2024 at 08:00:00 UTC.
10-digit timestamps are in seconds and are the Unix standard used by most systems, including Linux, Python, PHP, and databases. 13-digit timestamps are in milliseconds and are used primarily by JavaScript, which represents time with Date.now() returning milliseconds. The tool auto-detects which unit you have based on digit count, but you can override it manually using the Seconds or Milliseconds buttons.
In JavaScript, pass milliseconds to the Date constructor: new Date(timestamp * 1000) if you have seconds, or new Date(timestamp) if you already have milliseconds. Then call .toISOString(), .toUTCString(), or .toLocaleString() to format it. This tool does exactly that conversion in your browser, so you can verify the output before using it in code.
Epoch time zero is the value 0 in Unix time, which corresponds to Thursday, January 1, 1970 at 00:00:00 UTC. This date was chosen when Unix was being developed in the early 1970s as a practical starting point. You can enter 0 in the timestamp field of this tool to confirm it converts correctly to that date and time.
Yes. Negative Unix timestamps represent dates before January 1, 1970. For example, -86400 is December 31, 1969 at 00:00:00 UTC. Most modern systems and programming languages support negative timestamps correctly. Enter a negative value in the timestamp field to convert any pre-1970 date. Note that very old dates (before 1901) may not be reliably supported in all browsers.