DateTime MCP Server

Instructions

Implementation Reference

• server.py:98-124 (handler)

  The handler function for the 'get_current_time' tool. It is registered via the @mcp.tool decorator. Loads timezone and format from configuration, computes current time, formats it (12h or 24h), and returns as ToolResult.
  @mcp.tool def get_current_time(ctx: Context = None) -> ToolResult: """ Get the current time in the configured format. Returns: Time string in 12-hour or 24-hour format based on TIMEFMT setting Examples: With TIMEFMT="12": "2:30 PM" With TIMEFMT="24": "14:30" """ tz_string, time_format = load_config(ctx) timezone = get_timezone(tz_string) # Get current time in the specified timezone now = datetime.now(timezone) if time_format == "12": # 12-hour format with AM/PM result_text = now.strftime("%I:%M %p").lstrip('0') else: # 24-hour format (default) result_text = now.strftime("%H:%M") # Return raw text without JSON wrapping - more efficient per policy return ToolResult(content=[TextContent(type="text", text=result_text)])
• server.py:19-46 (helper)

  Helper function to load timezone string and time format from context headers or environment variables, with defaults.
  def load_config(context: Optional[Context] = None) -> tuple[str, str]: """ Load timezone and time format configuration. For HTTP transport, configuration comes from headers. For stdio transport, configuration comes from environment variables. Returns: tuple: (timezone_string, time_format) """ # Default values default_tz = "UTC" default_timefmt = "24" # Try to get from context headers first (HTTP transport) if context and hasattr(context, 'meta') and context.meta: headers = context.meta.get('headers', {}) tz_string = headers.get('DEFAULT_TZ', headers.get('default_tz')) time_format = headers.get('TIMEFMT', headers.get('timefmt')) if tz_string and time_format: return tz_string, time_format # Fall back to environment variables (stdio transport) tz_string = os.getenv('DEFAULT_TZ', default_tz) time_format = os.getenv('TIMEFMT', default_timefmt) return tz_string, time_format
• server.py:49-64 (helper)

  Helper function to resolve timezone string to ZoneInfo object, falling back to UTC on error.
  def get_timezone(tz_string: str) -> ZoneInfo: """ Convert timezone string to ZoneInfo object. Args: tz_string: Timezone identifier (e.g., "America/New_York", "UTC") Returns: ZoneInfo object, defaults to UTC if invalid timezone """ try: return ZoneInfo(tz_string) except Exception: # Graceful fallback to UTC for invalid timezones return ZoneInfo("UTC")
• server.py:98-98 (registration)

  The @mcp.tool decorator registers the get_current_time function as an MCP tool.
  @mcp.tool