Epoch / ISO / RFC3339 Converter
Convert timestamps between Unix epoch, ISO 8601, RFC3339, and readable local/UTC formats. Copy-ready snippets with deep links like /time/timestamp?iso=2025-01-01T00:00:00Z.
Display mode
Toggle RFC3339 output and previews between local timezone and UTC.
Unix epoch (seconds)
e.g. 1735689600
Unix epoch (milliseconds)
e.g. 1735689600000
ISO 8601
Always UTC
RFC3339
Local offset
Mon, Dec 15, 2025, 6:47:00 AM UTC
Mon, Dec 15, 2025, 6:47:00 AM UTC
Why this converter matters
Logs, APIs, cron jobs, and AI agents all swap between Unix epoch, ISO 8601, and RFC3339. This tool keeps everything in sync with a single canonical timestamp you can share or deep link.
Shareable tips
- Link QA tickets with exact timestamps via URLs like
/time/timestamp?iso=2024-11-01T12:34:56Z. - Switch to UTC before copying RFC3339 for APIs that reject local offsets.
- Use the millisecond field to match JavaScript
Date.now()outputs instantly, then drop the value into the timezone converter if you need to share it in a teammate's local time. - Plot intervals faster by combining this tool with the duration calculator whenever you're auditing SLAs or retention windows.