Timestamp and date tools for Unix time, APIs, logs, and tokens
Time bugs often come from unit confusion, timezone assumptions, or values copied from tokens and logs without context. These tools help convert the value first, then connect it to the API, JWT, or log workflow where it appeared.
Tools in this workflow
Converters
OpenTimestamp Converter
Convert Unix seconds, Unix milliseconds, and ISO date strings with readable UTC and local output.
API & Auth
OpenJWT Expiry Checker
Show whether a JWT is expired, valid, or missing expiry claims with readable timestamps.
Dev Debug Helpers
OpenLog Prettifier
Format JSON logs and semi-structured log lines into cleaner readable output for debugging.
Dev Debug Helpers
OpenCron Expression Reader
Interpret common cron expressions, validate input, and explain schedules in human language.
FAQ
How do I know whether a timestamp is seconds or milliseconds?
Unix seconds are usually 10 digits for current dates, while milliseconds are usually 13 digits. Convert both when the source system is unclear.
Why do readable dates differ between tools?
Timezone display settings can differ. Keep UTC and local time visible when debugging API, database, or token expiry issues.