What is the difference between 10-digit and 13-digit timestamps?
In most workflows, 10 digits represent Unix seconds and 13 digits represent Unix milliseconds. The tool shows both interpretations to make verification faster.
Timestamp Converter
Convert between Unix seconds, Unix milliseconds, ISO timestamps, and local time while debugging logs, APIs, and expiration values.
All timestamp conversion happens locally in your browser for quick log and API debugging.
All timestamp conversion happens locally in your browser for quick log and API debugging.
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When to use the timestamp converter
Use this page when logs, database fields, JWT expirations, or API responses force you to switch between seconds, milliseconds, and ISO strings.
It turns one input into several practical formats so you can verify the correct interpretation faster.
It is especially useful for the common question: “Is this value seconds or milliseconds?”
Timestamp converter FAQ
Why are local time and UTC different?
Your browser renders local time in your current timezone, while ISO and UTC values use a normalized timezone representation.