Generate sequential epoch timestamps with custom step intervals for database testing & seeders.
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.
Choose your start and end date/time.
Select intervals in hours, days, weeks, or months.
Copy as seconds, milliseconds, ISO strings, or a JSON array.
10-digit Unix seconds, 13-digit milliseconds, ISO-8601 strings, and structured JSON arrays.
To preserve browser performance, sequences generate up to 1,000 items per batch.
Zero-egress companion tools in the Date & Time suite
Convert Microsoft Excel 1900 date system serial integers into standard ISO 8601 timestamps.
Calculate continuous Julian Day Numbers (JDN) and Modified Julian Date (MJD) from Gregorian dates.
Convert high-precision 19-digit nanosecond timestamps into formatted UTC strings.
Check exact clock shift dates and hour offsets for US, EU, and global timezones.
