Inspect JWT timestamps
Convert exp, iat, and nbf claims into readable dates while debugging tokens.
Free browser tool
Unix Timestamp Converter
The Unix timestamp converter translates Unix time into readable UTC and local dates. It also converts date strings back into seconds and milliseconds since the Unix epoch.
Timestamps appear in logs, JWT claims, API payloads, databases, analytics exports, and scheduling systems. This tool makes those values easier to inspect while debugging.
Unix timestamp converter
Convert Unix timestamps and date strings.
What this tool does
Unix timestamps represent time as a number counted from January 1, 1970 UTC. They appear in logs, databases, JWT claims, monitoring events, analytics exports, and API responses. The number is compact, but it is not easy to read directly.
This converter turns timestamps into UTC and local dates, and turns date strings back into timestamp values. It reports seconds and milliseconds because different systems use different units.
Common use cases
Read log events
Turn numeric log timestamps into local or UTC times.
Prepare test data
Create timestamp values for fixtures and API examples.
Example before and after
A compact numeric timestamp becomes a readable ISO date once the unit is interpreted correctly.
Unix seconds
1778529600Readable UTC
2026-05-11T12:00:00.000ZHow to use
- Paste a Unix timestamp or date string.
- Choose Timestamp to Date or Date to Timestamp.
- Review UTC, local, seconds, and milliseconds output.
Common errors
Seconds vs milliseconds
A 10-digit value is usually seconds; a 13-digit value is usually milliseconds.
Timezone confusion
UTC and local time can show different dates depending on timezone offset.
Invalid date parsing
Ambiguous date strings can parse differently across environments.
Why use this tool
Read timestamps from logs and APIs.
Convert JWT exp and iat claims.
Prepare timestamps for tests and examples.
Best practices
Store UTC
Use UTC timestamps in APIs and databases to avoid timezone ambiguity.
Label units
Document whether a field expects seconds or milliseconds.
Use ISO for display
ISO dates are easier for humans to inspect than raw timestamp numbers.
Related tools
Related guides
Unix timestamp explained
Unix timestamps count time from the Unix epoch, but seconds, milliseconds, and timezones often cause confusion.
What is JWT and how to decode it
JWTs are common in authentication. Learn what the three sections mean and why decoding is not verification.
Best practices for working with API responses
API responses are easier to debug when you validate syntax, format payloads, inspect errors, and compare changes deliberately.
FAQ
Does Unix time use seconds or milliseconds?
Unix timestamps often use seconds, while JavaScript timestamps use milliseconds. This tool reports both.
What timezone is used?
The output includes UTC and your browser's local timezone representation.
Can it parse ISO dates?
Yes. Date strings that JavaScript can parse can be converted.
Is data uploaded?
The tool runs in your browser and does not require login, a database, or server-side processing.