Free online Unix timestamp converter. Convert between seconds/milliseconds timestamps and dates. Multi-timezone support, batch conversion. Pure frontend. | No Signup, Client-Side · No Server Uploads
Zero Dependencies·Works OfflineEnter a timestamp or date for bidirectional conversion.
Unix Timestamp Converter
A free online tool for bidirectional conversion between Unix timestamps and dates. Supports seconds and milliseconds, multiple timezones, various output formats.
Key Features
- Bidirectional: Timestamp to date and reverse, supports seconds and milliseconds
- Multi-timezone: Switch between local and UTC
- Live update: Shows current Unix timestamp
- Multi-format: Unix seconds/ms, ISO 8601, local time string
Dev Use Cases
Verify timestamp fields during API debugging; validate database timestamp fields; interpret log file timestamps.
FAQ
What is a Unix timestamp?
A Unix timestamp is the number of seconds since January 1, 1970 UTC. 10-digit is seconds, 13-digit is milliseconds.
How to distinguish seconds vs milliseconds timestamps?
10-digit numbers (~1.7 billion) are second-level timestamps. 13-digit numbers (~1.7 trillion) are millisecond-level. Using the wrong unit causes date errors.
Will timestamps overflow?
32-bit systems overflow on January 19, 2038. Modern 64-bit systems support timestamps up to 292 billion years from now.
Why does my timestamp show the wrong time?
This may be a timezone issue. Select the correct timezone (Local/UTC) in the tool.
Is this tool safe?
Yes. All conversions happen locally in your browser. No data is uploaded to any server.
Feedback: dexshuang@google.com