rfc3339.date

Strict RFC3339 time API for current time, validation, conversion, timezone lookup, transitions, and human event-time parsing. The examples below are live requests against the public API.

This is a fun project, not a reliable source of correct date or time. It only reports this server's current clock and is not backed by any serious timekeeping hardware or authority.

rfc3339.date clock emblem

Output Mode

Examples default to plain text so you see the one-line API result first.

Event Times

Convert human-style event text into your timezone.

These two cards focus on the new /tz/convert endpoint and start with your browser timezone as the target.

Event Time

tomorrow 10am PST

Turn announcement-style event text into your own timezone or any other target zone.

Live
Event Time parameters

Copyable Curl

Live Output

loading 
waiting for response…

STD Hint

5pm STD

STD needs a winter base date in the source region. Switch back to DST when you move the base into summer. Base .

Live
STD Hint parameters

Copyable Curl

Live Output

loading 
waiting for response…

Other Endpoints

A couple more live API examples.

One example renders /now/tz. The other shows a plain /convert request.

Current Time In Zone

Use /now/tz to render the current instant directly in a named timezone.

Live
Current Time In Zone parameters

Copyable Curl

Live Output

loading 
waiting for response…

Format Conversion

Use /convert for exact format changes such as Unix seconds to RFC3339.

Live
Format Conversion parameters

Copyable Curl

Live Output

loading 
waiting for response…

Shell Helper

Copy a local helper for event conversions.

This bash helper sends free-form event text to /tz/convert and defaults the target zone to your browser timezone.

Copyable Bash Function

Agent Discovery

Machine-readable entry points for agents.

Remote MCP

Install MCP

Use https://rfc3339.date/mcp in clients that support remote HTTP MCP servers.

Codex

Add it with the Codex CLI

codex mcp add rfc3339 --url https://rfc3339.date/mcp

Opencode

Add it to your Opencode config

{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "rfc3339": {
      "type": "remote",
      "url": "https://rfc3339.date/mcp"
    }
  }
}