code: def usetz_now():
      
      USE_TZ = getattr(settings, 'USE_TZ', False)
      if USE_TZ and DJANGO_VERSION >= '1.4':
          return now()
      else:
          return datetime.utcnow()
docs: Determine current time depending on USE_TZ setting.
  
      Affects Django 1.4 and above only. if `USE_TZ = True`, then returns
      current time according to timezone, else returns current UTC time.