old_contents: import arrow
  
  
  def to_datetime(value):
      if value is None:
          return None
  
      # Parse ISO8601 datetime
      dt = arrow.get(value)
  
      # Return python datetime object
      return dt.datetime
  
new_contents: import arrow
  
  
  def to_datetime(value):
      if value is None:
          return None
  
      # Parse ISO8601 datetime
      dt = arrow.get(value)
  
      # Convert to UTC
      dt = dt.to('UTC')
  
      # Return naive datetime object
      return dt.naive
  
subject: Convert all datetime properties to UTC