code: def transformFromNative(cls, obj):
          
          # print('transforming from native')
          if obj.isNative:
              obj.isNative = False
              tzid = TimezoneComponent.registerTzinfo(obj.value.tzinfo)
              obj.value = dateTimeToString(obj.value, cls.forceUTC)
              if not cls.forceUTC and tzid is not None:
                  obj.tzid_param = tzid
              if obj.params.get('X-VOBJ-ORIGINAL-TZID'):
                  if not hasattr(obj, 'tzid_param'):
                      obj.tzid_param = obj.x_vobj_original_tzid_param
                  del obj.params['X-VOBJ-ORIGINAL-TZID']
  
          return obj
docs: Replace the datetime in obj.value with an ISO 8601 string.