A Unix timestamp is the number of seconds since 1 January 1970, 00:00:00 UTC. Logs, APIs, and databases use it because it’s a single number—easy to store, sort, and compare—and it’s the same everywhere until you convert it to a local timezone for display. When you see something like `1735689600` in a log or API response, you need to know what moment that is. A timestamp converter does that: you enter the number (or paste it), and it shows the date and time in UTC or your timezone. You can also do the reverse: enter a date and time and get the Unix timestamp. Useful when you’re building or testing an API that expects a timestamp, or when you’re writing a query like “events after this moment.”
When do you use it? When you’re debugging logs and the only time you see is a big number. When an API returns a timestamp and you want to know what date it is. When you’re writing code and need the timestamp for “start of today” or “this time next week.” When someone in support asks “when did this happen?” and you’ve only got the timestamp. Some systems use milliseconds (13 digits) instead of seconds (10 digits); a good converter handles both so you don’t get the wrong day.
There’s no magic—it’s just conversion between “seconds since epoch” and “human-readable date.” But doing it by hand is error-prone, and timezones make it worse. A converter does it correctly every time.
Our timestamp converter is free and runs in your browser. Enter a timestamp to get the date and time, or enter a date and time to get the timestamp. No sign-up, no data stored. Use it for logs, APIs, or any time you need to flip between “that number” and “that moment in time.”