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Unix Timestamp Converter — Free Online Tool
A Unix timestamp, also called epoch time, counts the seconds that have passed since midnight UTC on 1 January 1970. Databases, APIs, log files and JWT tokens all use it because it is compact and independent of time zones, but a number like 1700000000 is impossible to read at a glance. This converter translates it into a human date in one step. Paste a timestamp and the tool detects whether it is in seconds or milliseconds, then shows the UTC date, the ISO 8601 string, your local time and a relative description such as three days ago. Going the other way, pick a date and time and you get the matching epoch value in both seconds and milliseconds, ready to paste into code, a database query or a cron setup. A live clock at the top displays the current Unix time, updating every second. Developers use it to debug expiry claims, compare log entries from different servers, set cache headers and write tests that depend on fixed moments. Remember that date pickers are interpreted in your local time zone, while the UTC and ISO outputs always refer to Coordinated Universal Time. Thirteen digit values are treated as milliseconds, which is what JavaScript's Date.now returns. Everything runs in your browser and nothing is uploaded.
Use our Unix Timestamp Converter on AllConvertor — no registration, no download, works on iPhone, Android, Windows, and Mac. All processing runs in your browser when possible for maximum privacy and speed.
How to use Unix Timestamp Converter
- Paste a Unix timestamp in seconds or milliseconds.
- Read the UTC, ISO 8601 and local date outputs.
- To go the other way, choose a date and time in the picker.
- Copy the epoch seconds or milliseconds into your code.
- Use the current time button to reset both fields.
Key benefits
- ✓ 100% free — no paywall or trial limits
- ✓ No account or email required
- ✓ Mobile-friendly responsive design
- ✓ Instant results in your browser
- ✓ Secure — data stays on your device
- ✓ Trusted by thousands of users daily
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Frequently Asked Questions
What is a Unix timestamp?
It is the number of seconds elapsed since 00:00:00 UTC on 1 January 1970, known as the Unix epoch. It is widely used to store and exchange dates in software.
How do I tell seconds from milliseconds?
Ten digit values are normally seconds and thirteen digit values are milliseconds. The tool detects the unit automatically and tells you which one it assumed.
How do I convert a date to a Unix timestamp?
Pick the date and time in the Date to Timestamp section. The tool shows the epoch value in seconds and milliseconds, interpreting your input in your local time zone.
Does a Unix timestamp depend on time zone?
No. A timestamp always refers to a single moment in UTC. Only the displayed date changes with your time zone, which is why UTC and local times are shown separately.
What is the year 2038 problem?
Systems that store timestamps as signed 32-bit integers overflow on 19 January 2038. Modern systems use 64-bit values, which this converter handles without trouble.