Unable to set modified date, created date and document id

[HorusTheSonOfOsiris]

When I try to update a file’s created date and modified date it doesn’t get updated. I can see that on SharePoint a new version is created but the field values doesn’t change.
@vgrem: please help
Here is the code:

file = ctx.web.get_file_by_server_relative_url('File path')
ctx.load(file)
ctx.execute_query()

fields = file.listItemAllFields.get().execute_query()
fields.set_property('Created', '2015-03-09T23:49:29Z', persist_changes=True)
fields.set_property('Modified', '2015-03-09T23:49:29Z', persist_changes=True)
fields.update()
ctx.execute_query()

[vgrem]

Greetings,

rather late but anyway, it is nowadays (in version 2.3.11 or above) supported to update list item system metadata (namely Created/Modified/Author/Editor properties), here is an example:

ctx = ClientContext(site_url).with_credentials(credentials)

list_tasks = ctx.web.lists.get_by_title("Tasks")
items = list_tasks.items.get().top(1).execute_query()
if len(items) == 0:
    sys.exit("No items for update found")

item_to_update = items[0]  # type: ListItem
author = ctx.web.site_users.get_by_email(user_principal_name)

modified_date = datetime.utcnow() - timedelta(days=3)
result = item_to_update.validate_update_list_item({
    "Author": FieldUserValue.from_user(author),
    "Modified": modified_date
}).execute_query()

has_any_error = any([item.HasException for item in result.value])
if has_any_error:
    print("Item update completed with errors, for details refer 'ErrorMessage' property")
else:
    print("Item has been updated successfully")

[r2oro]

Hello. My goal is to preserve modification time after value is assigned to a custom property of SharePoint file (unfortunately it changes modification time, what is not desired). I did follow example above. The query did not return exception. Actually I got positive response (if time format was wrong I was getting HasException == True), but it did not modification time correctly. Actually file modification time was updated to the time of when this request was sent!
This is the code I've written:

   def mark_processed(self, file):
        '''Set property of SharePoint file indicating that it was processed'''
        file_id = file.listItemAllFields.get().execute_query().id
        file_item = self.ctx.web.lists.get_by_title(self.sharepoint_lib).get_item_by_id(file_id).get().execute_query()
        file_metadata = file_item.properties
        mdate_utc = datetime.strptime(file_metadata['Modified'], SP_MDATE_READ_FORMAT).astimezone(tz=tz.utc)
        property_name = self.processed_poperty_name()
        if not property_name in file_metadata.keys():
            self.create_property(property_name)
        prop_value = datetime.today().strftime(SP_PROP_WRITE_FORMAT)
        file_item.set_property(property_name, prop_value).update().execute_query()
        logger.debug('Set %s property %s as %s', file.serverRelativeUrl , property_name, prop_value)
        # For some reason below does not work, despite the fact that people say it works for them...
        mdate_utc_str = mdate_utc.strftime(SP_MDATE_WRITE_FORMAT)
        client_result = file_item.validate_update_list_item(
            {'Modified': mdate_utc_str}
        ).execute_query()
        self.raise_for_o365(client_result)        
        logger.debug('Reversed modification time of %s to %s', file.serverRelativeUrl , mdate_utc_str)

    def raise_for_o365(self, result):
        '''Raise exception if o365 query request finished with exception'''
        for item in result.value:
            if item.HasException:
                raise requests.RequestException(f'SharePoint API resulted with error: {item.ErrorMessage}')