Timestamp converter
Convert between Unix timestamps and human-readable dates. Seconds and milliseconds detected automatically.
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Timestamp → date
In seconds or milliseconds — we detect it automatically.
Date → timestamp
What is a Unix timestamp?
A Unix timestamp (or epoch time) is the number of seconds elapsed since January 1, 1970 at 00:00:00 UTC. It is the standard way systems store and compare dates, because a plain number avoids timezone and format issues.
For example, 1753871234 corresponds to July 30, 2025. Many APIs and databases express it in milliseconds (thirteen digits instead of ten), and this tool detects both formats automatically.
Quick tips
- Unix timestamps are always in UTC: the conversion to your local time is done by your browser.
- If your timestamp has 13 digits, it is in milliseconds; if it has 10, in seconds.
- The ISO 8601 format (
2026-07-29T12:00:00.000Z) is the recommended one for exchanging dates between systems.
Frequently asked questions
What is a Unix timestamp?
It is the number of seconds elapsed since January 1, 1970 at 00:00:00 UTC, also called epoch time. It is the most common way systems store and compare dates.
Does the tool use seconds or milliseconds?
It accepts both. If the value has 10 digits it treats it as seconds; if it has 13, as milliseconds. The detection is automatic.
Which timezone does it use to display the date?
It shows both your local time (whatever your browser is set to) and UTC. The Unix timestamp itself is always UTC.
What will happen to timestamps in 2038?
32-bit systems that store them as a signed integer will hit their limit on January 19, 2038. Most modern systems already use 64-bit integers, so they will not be affected.