Does this support both seconds and milliseconds?

Yes, 10-digit timestamps are treated as seconds and 13-digit timestamps as milliseconds.

Can I enter a date string instead of numbers?

Yes, entering a date like 2026-11-13 converts it into Unix epoch seconds and milliseconds.

100% Client-Side • Zero Data Leaves Browser

Convert Unix epoch seconds or milliseconds to ISO 8601, UTC, and local dates—or convert date strings back to epoch.

Active Converter / Utility

Input Data Upload File

Output Result