Free tool
DeveloperUnix Timestamp Converter
Convert Unix epoch seconds or milliseconds to human dates, or parse ISO dates back to timestamps—all in your browser.
Runs in your browser — your data stays on your device
Free toolAPIs love integers; humans love calendars. This free Unix timestamp converter turns epoch seconds or milliseconds into UTC and local dates, and it accepts ISO date strings the other way. JavaScript developers and programming students use it constantly when REST API payloads disagree about units.
How to use the Unix Timestamp Converter
- 1
Paste a Unix timestamp (seconds or milliseconds) or an ISO date string.
- 2
Read seconds, milliseconds, UTC ISO, and local representations.
- 3
Tap Now chips to capture the current epoch while you debug.
Why seconds vs milliseconds still breaks production
JavaScript’s Date uses milliseconds; many backends use seconds. Mix them and you schedule jobs in the year 50,000. A quick converter next to your editor prevents that class of bug during coding practice and API reviews.
Unix time example
Enter 0 to see the Unix epoch (1970-01-01T00:00:00.000Z). Enter 1710000000 to see a March 2024 UTC instant. Large 13-digit values are treated as milliseconds automatically.
Guides and next steps
Privacy note
Timestamp conversion runs entirely in your browser. We do not log the values you enter.
Frequently asked questions
Explore more
Related free tools
More JSON, HTML, CSS, regex, cron, YAML, Git, and Python utilities for everyday engineering work.
UUID Generator
Free online UUID generator for JavaScript and API developers. Create RFC 4122 UUID v4 identifiers locally for REST APIs and web apps—no install needed.
Open toolJSON Formatter
Free online JSON formatter for JavaScript and frontend developers. Pretty-print API responses with 2- or 4-space indent locally in your browser.
Open toolJWT Decoder
Free online JWT decoder for API developers and cybersecurity students. Inspect header and payload locally for debugging and security testing—signature is not verified.
Open toolBase64 Encoder/Decoder
Free online Base64 encoder/decoder for JavaScript, API, and web developers. Encode or decode UTF-8 text locally in your browser—no install required.
Open toolURL Encoder/Decoder
Free online URL encoder/decoder for web and API developers. Percent-encode query text or decode %20 sequences locally without installing software.
Open toolJSON Validator
Free online JSON validator for JavaScript and frontend developers. Paste API responses or config files to check syntax and approximate error location—no install.
Open toolReady to go beyond free tools?
Live mentor-led courses turn calculator practice into real networking and IT skill.