Time MCP Server

Instructions

Implementation Reference

• src/mcp_server_time/server.py:70-116 (handler)

  Core implementation of the convert_time tool: parses HH:MM time string, constructs full datetime in source timezone for today, converts to target timezone, computes offset difference, and returns structured TimeConversionResult.
  def convert_time( self, source_tz: str, time_str: str, target_tz: str ) -> TimeConversionResult: """Convert time between timezones""" source_timezone = get_zoneinfo(source_tz) target_timezone = get_zoneinfo(target_tz) try: parsed_time = datetime.strptime(time_str, "%H:%M").time() except ValueError: raise ValueError("Invalid time format. Expected HH:MM [24-hour format]") now = datetime.now(source_timezone) source_time = datetime( now.year, now.month, now.day, parsed_time.hour, parsed_time.minute, tzinfo=source_timezone, ) target_time = source_time.astimezone(target_timezone) source_offset = source_time.utcoffset() or timedelta() target_offset = target_time.utcoffset() or timedelta() hours_difference = (target_offset - source_offset).total_seconds() / 3600 if hours_difference.is_integer(): time_diff_str = f"{hours_difference:+.1f}h" else: # For fractional hours like Nepal's UTC+5:45 time_diff_str = f"{hours_difference:+.2f}".rstrip("0").rstrip(".") + "h" return TimeConversionResult( source=TimeResult( timezone=source_tz, datetime=source_time.isoformat(timespec="seconds"), is_dst=bool(source_time.dst()), ), target=TimeResult( timezone=target_tz, datetime=target_time.isoformat(timespec="seconds"), is_dst=bool(target_time.dst()), ), time_difference=time_diff_str, )
• src/mcp_server_time/server.py:141-162 (registration)

  Registration of the 'convert_time' tool via @server.list_tools(), specifying name, description, and JSON schema for inputs: source_timezone, time (HH:MM), target_timezone.
  Tool( name=TimeTools.CONVERT_TIME.value, description="Convert time between timezones", inputSchema={ "type": "object", "properties": { "source_timezone": { "type": "string", "description": f"Source IANA timezone name (e.g., 'America/New_York', 'Europe/London'). Use '{local_tz}' as local timezone if no source timezone provided by the user.", }, "time": { "type": "string", "description": "Time to convert in 24-hour format (HH:MM)", }, "target_timezone": { "type": "string", "description": f"Target IANA timezone name (e.g., 'Asia/Tokyo', 'America/San_Francisco'). Use '{local_tz}' as local timezone if no target timezone provided by the user.", }, }, "required": ["source_timezone", "time", "target_timezone"], }, ),
• src/mcp_server_time/server.py:22-32 (schema)

  Pydantic schemas for output structures: TimeResult (per-timezone info) and TimeConversionResult (source/target times and difference). Used by the handler to validate/structure response.
  class TimeResult(BaseModel): timezone: str datetime: str is_dst: bool class TimeConversionResult(BaseModel): source: TimeResult target: TimeResult time_difference: str
• src/mcp_server_time/server.py:17-20 (helper)

  Enum defining tool names, including CONVERT_TIME used in registration and dispatch.
  class TimeTools(str, Enum): GET_CURRENT_TIME = "get_current_time" CONVERT_TIME = "convert_time"
• src/mcp_server_time/server.py:179-190 (handler)

  Dispatch logic in @server.call_tool() that validates arguments and invokes the convert_time handler.
  case TimeTools.CONVERT_TIME.value: if not all( k in arguments for k in ["source_timezone", "time", "target_timezone"] ): raise ValueError("Missing required arguments") result = time_server.convert_time( arguments["source_timezone"], arguments["time"], arguments["target_timezone"], )