Unix Timestamp Converter

How to use Timestamp Converter

1. Paste a Unix timestamp into the input box.
2. Choose Auto, Seconds, or Milliseconds.
3. Review local time, UTC time, and ISO output.
4. Use Current time when you need a fresh timestamp.

Why this tool exists

Unix timestamps are compact, timezone-neutral numbers used in APIs, databases, logs, JWT claims, queues, and analytics events. They are efficient for systems but awkward for people. This converter turns epoch seconds or milliseconds into readable local and UTC dates so you can debug time-based behavior without guessing.

The most common mistake is mixing seconds and milliseconds. JavaScript dates use milliseconds, while many APIs and JWT claims use seconds. A value like 1710000000 is likely seconds; a value like 1710000000000 is likely milliseconds. CleanWebTools detects the likely unit and also lets you choose explicitly when you need control.

Timezone handling matters. A timestamp represents one instant, but the displayed clock time changes depending on local timezone. This page shows both local time and UTC to reduce ambiguity. For distributed systems, logs, and security investigations, UTC is usually the safer reference.

This tool runs entirely in the browser and does not need a server. It pairs naturally with the JWT Decoder when checking exp, iat, and nbf claims, and with JSON Formatter when inspecting API payloads that include epoch values.

Common examples

• Convert a JWT exp claim into a readable date.
• Check whether an API event timestamp is seconds or milliseconds.
• Generate the current Unix timestamp for a test request.

FAQ