Mahiro Ando, if you are calling web services as a system admin, you can use the "run as" feature to set a different author:
However, for timestamps, there is currently no support for backdating in the API. This is, however, something that is in the roadmap and will likely make it into the API sometime this year.
We have Jive 8.0.X version and we are able to use run-as as well as backdating. But the issue is if we use backdating + run as we are getting bad request .
If we use either of these features it works fine.
if we use following API and basic authentication w/o run-as then it creates backdated discussion.
but if we use the same api with run-as : X-Jive-Run-As username [username] we get 400 - Bad request