chrono-mcp

MCP (Model Context Protocol) server for parsing natural language date/time expressions using chrono-node.

Features

• 🌍 Timezone-aware parsing with simple offset values
• 📅 Supports relative dates, absolute dates, and date ranges
• 🔄 Configurable reference date and forward/backward preference
• 🎯 Returns both certain and implied components
• ⚡ Stateless HTTP transport for Cloudflare Workers

Deployment

This server is designed to be deployed on Cloudflare Workers with Routes:

# Install dependencies
bun install

# Type check
bun run type-check

# Run tests
bun test

# Deploy to Cloudflare
bun run deploy

MCP Tool: chrono_parse

Query Parameters

You can set a default timezone offset for all requests using a query parameter:

POST https://mcp.srz.me/chrono?timezone_offset=540

Benefits:

• The default value will be used if timezone_offset is not specified in tool arguments
• Tool description and parameter hints are automatically updated to reflect the current default
• Example: When ?timezone_offset=540 is set, the tool description shows: "Default timezone: +09:00 (540 minutes from UTC)"

Input Parameters

Required

• text (string): Text containing date/time expressions to parse

Optional

• reference (string): Reference date/time as ISO 8601 string

  • Example: "2025-10-05T10:00:00Z" or "2025-10-05T10:00:00+09:00"
  • Default: Current time

• timezone_offset (number): Timezone offset in minutes from UTC

  • Example: 540 for JST (+09:00), -300 for EST (-05:00)
  • Default: Query parameter value, or 0 (UTC)

• forwardOnly (boolean): Prefer future dates when ambiguous

  • Default: true

• mode (enum: "first" | "all"): Parse mode

  • "first": Return first match only (default)
  • "all": Return all matches

Output Schema

{
  results: [
    {
      text: string              // Matched text
      isRange: boolean
      start: {
        iso: string             // ISO 8601 in specified timezone
        unix: number            // Unix timestamp (ms)
        timezoneOffset: number | null
        certain: string[]       // Explicit components
        implied: string[]       // Filled-in components
      }
      end?: { ... }             // For ranges
    }
  ]
  summary: string               // Brief description
}

Example Usage

Basic parsing

{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "chrono_parse",
    "arguments": {
      "text": "tomorrow at 3pm"
    }
  }
}

With timezone offset in arguments

{
  "jsonrpc": "2.0",
  "id": 2,
  "method": "tools/call",
  "params": {
    "name": "chrono_parse",
    "arguments": {
      "text": "明日の17時",
      "reference": "2025-10-05T10:00:00+09:00",
      "timezone_offset": 540
    }
  }
}

With timezone offset in query parameter

# Set default timezone_offset via query parameter
POST https://mcp.srz.me/chrono?timezone_offset=540

{
  "jsonrpc": "2.0",
  "id": 3,
  "method": "tools/call",
  "params": {
    "name": "chrono_parse",
    "arguments": {
      "text": "明日の17時"
      // timezone_offset not specified, uses query parameter default (540)
    }
  }
}

Parse all matches

{
  "jsonrpc": "2.0",
  "id": 4,
  "method": "tools/call",
  "params": {
    "name": "chrono_parse",
    "arguments": {
      "text": "Meeting on Monday at 10am and deadline on Friday at 5pm",
      "mode": "all",
      "timezone_offset": 540
    }
  }
}

Date range

{
  "jsonrpc": "2.0",
  "id": 5,
  "method": "tools/call",
  "params": {
    "name": "chrono_parse",
    "arguments": {
      "text": "from Monday to Friday",
      "timezone_offset": 0
    }
  }
}

Timezone Offset Reference

Region	Offset (minutes)	UTC Offset
JST (Japan)	540	+09:00
EST (US Eastern)	-300	-05:00
PST (US Pacific)	-480	-08:00
UTC	0	+00:00
IST (India)	330	+05:30
ACST (Australia Central)	570	+09:30

Routes Configuration

The server is configured to run at https://mcp.srz.me/chrono* using Cloudflare Routes.

License

MIT