old_contents: import sys
  from datetime import datetime
  from os import makedirs
  from os.path import exists, expanduser, join
  
  from flask import g
  
  
  try:
      from pyinstrument import Profiler
  except ImportError:
      pass
  
  
  def default_profile_dir(name):
      return expanduser("~/.{name}/profile".format(name=name))
  
  
  def enable_profiling(graph):
      if "pyinstrument.profiler" not in sys.modules:
          raise Exception("Profiling requires 'pyinstrument'. Make sure it is installed.")
  
      profile_dir = graph.config.flask.profile_dir or default_profile_dir(name=graph.metadata.name)
      if not exists(profile_dir):
          makedirs(profile_dir)
  
      graph.app.config['PROFILE'] = True
  
      app = graph.flask
  
      @app.before_request
      def before_request():
          g.profiler = Profiler()
          g.profiler.start()
  
      @app.after_request
      def after_request(response):
          g.profiler.stop()
          output_html = g.profiler.output_html()
  
          time_tag = datetime.now().strftime("%y-%m-%d-%H-%M-%S")
          profile_path = join(profile_dir, f"profile-{time_tag}.html")
          with open(profile_path, "w") as f:
              f.write(output_html)
          graph.app.logger.info(f"Profile saved into: {profile_path}")
  
          return response
  
      graph.app.logger.info(f"*** Profiling is ON, Will save profiling data to directory: {profile_dir}")
  
new_contents: import sys
  from datetime import datetime, timezone
  from os import makedirs
  from os.path import exists, expanduser, join
  
  from flask import g
  
  
  try:
      from pyinstrument import Profiler
  except ImportError:
      pass
  
  
  def default_profile_dir(name):
      return expanduser("~/.{name}/profile".format(name=name))
  
  
  def enable_profiling(graph):
      if "pyinstrument.profiler" not in sys.modules:
          raise Exception("Profiling requires 'pyinstrument'. Make sure it is installed.")
  
      profile_dir = graph.config.flask.profile_dir or default_profile_dir(name=graph.metadata.name)
      if not exists(profile_dir):
          makedirs(profile_dir)
  
      graph.app.config['PROFILE'] = True
  
      app = graph.flask
  
      @app.before_request
      def before_request():
          g.profiler = Profiler()
          g.profiler.start()
  
      @app.after_request
      def after_request(response):
          g.profiler.stop()
          output_html = g.profiler.output_html()
  
          now = datetime.now(timezone.utc)
          timestamp = now.strftime("%Y-%m-%dT%H%M%S.%fZ")
          profile_path = join(profile_dir, f"profile-{timestamp}.html")
          with open(profile_path, "w") as f:
              f.write(output_html)
          graph.app.logger.info(f"Profile saved into: {profile_path}")
  
          return response
  
      graph.app.logger.info(f"*** Profiling is ON, Will save profiling data to directory: {profile_dir}")
  
subject: Fix profiling timestamp (#286)