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

Local preview

Sun, Oct 26, 2025, 7:51:34 PM UTC

UTC preview

Sun, Oct 26, 2025, 7:51:34 PM 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.