Convert between Unix timestamps and human-readable UTC/ISO dates.
Execution runs 100% locally inside the browser sandbox using HTML5 Canvas, Web Cryptography Subtle API, and Web Workers. Zero egress.
Zero network latency. Operates completely offline with zero dependencies on third-party backend servers or cloud services.
Built according to official RFC specifications, cryptographic test vectors, and enterprise-grade data transformation standards.
Input a Unix timestamp (seconds or milliseconds) or pick a calendar date.
View instant conversions in UTC, local timezone, ISO 8601, RFC 2822, and relative time.
Copy any date string format with one click for database and API queries.
A Unix timestamp is the total number of seconds elapsed since January 1, 1970 00:00:00 UTC.
10-digit numbers are automatically treated as seconds and 13-digit numbers as milliseconds.
Zero-egress companion tools in the Date & Time suite
Convert times across world timezones and compute exact business days.
Calculate exact intervals, working business days, and future date offsets.
Calculate calendar and custom fiscal year quarters starting in any month (e.g. Feb, July, Oct).
Convert clock in/out minutes to standard payroll decimal hours (15-min / 6-min increments).
