Timestamp Converter – Free Online Unix Timestamp to Date Tool
About This Timestamp Converter
A Unix timestamp is a number representing the seconds that have passed since January 1, 1970, and it’s the format most servers, databases, and APIs use to store dates behind the scenes. This tool converts a raw timestamp into a readable date, or takes a date you pick and turns it into the matching Unix timestamp, in any timezone you need.
The BigToolSite Team tested this converter against known reference timestamps across multiple timezones to confirm the ISO 8601, RFC 2822, and RFC 3339 outputs all match expected values.
The tool automatically detects whether you’ve entered a timestamp in seconds or milliseconds, so you don’t need to do the math yourself. Results include the timestamp in both formats, several standard date formats, a human-readable version in your chosen timezone, and a relative time like “3 hours ago” or “in 2 days.” Support covers all 400+ IANA timezones, not just a handful of common ones.
If you’re working with dates that also need to be sorted or compared as plain text, our text diff checker can help spot differences between date strings. And if the timestamps are coming from a URL parameter, the URL encoder/decoder can clean those up first.
How to Use the Timestamp Converter
- Choose “Timestamp to Date” to convert a Unix timestamp, or “Date to Timestamp” to convert a calendar date.
- Enter your timestamp, or click “Use Current Timestamp” to grab the current time instantly.
- For date conversion, pick a date and time using the date picker.
- Select the timezone you want the result displayed in.
- Click “Convert” to see all the results, then click “Copy” next to any value to copy it.
Example Usage
Enter the timestamp 1700000000 with “Timestamp to Date” selected and UTC as the timezone, and the tool returns the full date in ISO 8601, RFC 2822, human-readable format, and relative time, all at once. Switch the timezone to see how the same moment reads in a different part of the world. Going the other direction, pick a date and time from the calendar picker and the tool instantly returns the matching Unix timestamp in both seconds and milliseconds.
Yes, it’s completely free with no signup required and no limits on how many conversions you can run.
Any value greater than 10 billion is automatically treated as milliseconds, since Unix timestamps in seconds won’t reach that number until the year 2286.
UTC is the safest default since it’s the reference point most servers and APIs use. Choose “Local” if you want the result in your own system’s timezone instead.
They’re very similar date formats, with RFC 3339 being a stricter, more specific profile of ISO 8601. Most modern systems accept either format interchangeably.
No. All conversions happen in real time and nothing you enter is saved or logged.
