Refering the document, since works for last update https://developer.github.com/v3/issues/#list-issues
Only issues updated at or after this time are returned. This is a timestamp in ISO 8601 format: YYYY-MM-DDTHH:MM:SSZ.
I want to have since on “create time”. there is sort option but I don’t think if that will help.
**Use case: Update can bring unintended issues as well because update is triggered on any update (**issue close or assignee removal etc.) which are likely to happen over a period unintensionally. For example, when a assignee leaves the repo, an update event is triggered autoatically and hence now all the issues pointed to to that assignee are new issues irrespective of their created time.