Time MCP Server

Instructions

Implementation Reference

• src/mcp_server_time/server.py:73-120 (handler)

  Core handler method implementing the convert_time tool logic, parsing input time, converting between timezones, calculating offset difference, and returning structured result.
  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"), day_of_week=source_time.strftime("%A"), is_dst=bool(source_time.dst()), ), target=TimeResult( timezone=target_tz, datetime=target_time.isoformat(timespec="seconds"), day_of_week=target_time.strftime("%A"), is_dst=bool(target_time.dst()), ), time_difference=time_diff_str, )
• src/mcp_server_time/server.py:22-33 (schema)

  Pydantic models defining the output schema for the convert_time tool (TimeResult for individual timezone info, TimeConversionResult for source/target comparison).
  class TimeResult(BaseModel): timezone: str datetime: str day_of_week: str is_dst: bool class TimeConversionResult(BaseModel): source: TimeResult target: TimeResult time_difference: str
• src/mcp_server_time/server.py:146-167 (registration)

  Tool registration in list_tools() defining name, description, and input schema for convert_time.
  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:184-195 (registration)

  Dispatch logic in call_tool() handler that invokes the convert_time method with parsed arguments.
  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"], )
• src/mcp_server_time/server.py:53-58 (helper)

  Helper function to safely create ZoneInfo object from timezone string, used in convert_time handler.
  def get_zoneinfo(timezone_name: str) -> ZoneInfo: try: return ZoneInfo(timezone_name) except Exception as e: raise McpError(f"Invalid timezone: {str(e)}")