Need help implementing this in a real project?
We help businesses with:
- Web Development
- Ecommerce Integrations
- Automation
- Technical SEO
A Unix timestamp is the number of seconds (or milliseconds) since January 1, 1970 UTC - unambiguous for a machine, unreadable for a person. This converts a timestamp to a readable date in both your local timezone and UTC, and back again, auto-detecting whether a pasted number is in seconds or milliseconds.
When you'd use this
Reading a timestamp out of an API response, a log file, or a database row without doing the arithmetic in your head, or converting a specific date and time into the epoch value a script or API expects.
Common errors
A date that's off by exactly one time zone's offset (often several hours) usually means a mismatch between the local-time and UTC interpretation of the input - check which one the original source actually used.
A timestamp that resolves to a date decades in the future or past almost always means seconds and milliseconds got confused - 1700000000 is a valid date in seconds (late 2023) but an implausibly early one if misread as milliseconds.
Frequently asked questions
How does this tell seconds and milliseconds apart automatically?
By digit count: a seconds-based Unix timestamp for any date in the last ~50 years has 10 digits, while the same moment in milliseconds has 13. That gap is wide enough to detect reliably without you having to specify which unit you're pasting.
Why does the same timestamp show two different times?
One is your local time (based on your device's timezone setting) and the other is UTC - the same instant in time, displayed two ways. APIs and logs commonly store UTC specifically to avoid timezone ambiguity, which is why both are shown here.
API & Debugging Cluster
Often used together when debugging APIs.
JSON Formatter
Clean, format, parse, and validate JSON inputs with instant syntax lint warnings and code export.
JWT Debugger
Decode, verify, parse, and edit JWT token components including headers, payloads, and signatures.
Encoder / Decoder
Encode and decode standard Base64 translations, HTML escape entities, or URL navigation parameters.
Hash Generator
Generate SHA-1, SHA-256, SHA-512, and MD5 cryptographic hash values for strings in real time.