Epoch converter: four free ways to turn Unix time into a date
A short list of epoch converters, from a private browser tool to one-liners for scripts.
By ClaudeGPT Si Newsroom · Editorial team
· 2 min read
An epoch converter changes a Unix timestamp, the count of seconds since 1 January 1970 UTC, into a readable date and back. Our pick is the free AyeTab Unix Time Converter, because it runs entirely in your browser and shows every format you are likely to need from one paste.
Below are four good ways to convert epoch time, from a one-click web tool to a line in the terminal.
1. AyeTab Unix Time Converter
Best for: everyday conversions by developers who want the result fast and private.
Paste a value into the "Timestamp or date" field and six cards appear: Unix seconds, Unix milliseconds, ISO 8601 in UTC, your local time with the zone name, a UTC date and a relative time. It treats a 13-digit number as milliseconds without asking, and a date string goes the other way into a timestamp. The Now button grabs the current second. Click a card and its value is on your clipboard.
Everything happens in the tab. AyeTab uploads nothing and asks for no account, so a timestamp copied from a production log stays on your machine. You can use it on the web, or install AyeTab for Chrome to keep the converter on your new tab page and in a side panel, next to a cron parser, a JWT decoder and the other tools. It is free.
2. Epoch Converter (epochconverter.com)
Best for: unusual precisions and reference material.
The site converts timestamps in seconds, milliseconds, microseconds and nanoseconds, and takes dates in many written formats. It also lists the timestamps for the start and end of a year, month or day, turns a number of seconds into years, days and hours, and keeps code snippets for many languages and databases. If your values have 16 or 19 digits, this is the one to open.
3. unixtimestamp.com
Best for: people who already use Dan's Tools.
unixtimestamp.com is part of the Dan's Tools collection of web utilities and covers epoch and Unix timestamp conversion in both directions. It is a reasonable second opinion when you want to check a result from another converter, and its menu links to many other small web tools such as format converters and number base converters.
4. Your terminal or code
Best for: batches and scripts.
When you have thousands of rows, do not convert by hand. A few one-liners cover most cases:
| Environment | Timestamp to date |
|---|---|
| GNU date | date -u -d @1800000000 |
| macOS date | date -u -r 1800000000 |
| JavaScript | new Date(1800000000 * 1000).toISOString() |
| Python | datetime.fromtimestamp(1800000000, tz=timezone.utc) |
| SQLite | SELECT datetime(1800000000, 'unixepoch'); |
Each returns 08:00 UTC on 15 January 2027 for that value.
How to choose
For a quick look at a value from a log or an API response, a browser tool wins, and AyeTab is the fastest of them to reach if it already sits on your new tab. Pick epochconverter.com when you need micro or nanosecond precision, or its year and month boundary tables. Reach for code once the job is more than a handful of values.
Whatever you use, check the digit count first. A 13-digit value read as seconds lands tens of thousands of years ahead, and a 10-digit value read as milliseconds lands in January 1970.