input: 
  from flask import Flask
  import datetime
  
  app = Flask(__name__)
  
  @app.route('/datetime')
  def get_datetime():
      """Create a web API with Python and Flask to give the current date and time.
      Example:
      If you access the route '/datetime', the output will be a string like '2023-10-05 14:30:00'
      representing the current date and time.
      """
      return datetime.datetime.now().strftime("%Y-%m-%d %H:%M:%S")
  
  if __name__ == '__main__':
      app.run()
  
output:     
      return datetime.datetime.now().strftime("%Y-%m-%d %H:%M:%S")
  