Yes this is possible to do just set the StartPublish or PublishDate on your writeable clone and save.
var parent = ContentReference.StartPage;
IContentRepository contentRepository = EPiServer.ServiceLocation.ServiceLocator.Current.GetInstance<IContentRepository>();
PageData myPage = contentRepository.GetDefault<StandardPage>(parent);
myPage.PageName = "My new page";
myPage.StartPublish = DateTime.Now;
myPage.Created = DateTime.Now;
contentRepository.Save(myPage, EPiServer.DataAccess.SaveAction.Publish);
You may use ForceCurrent Version for migration in SaveAction event, so while you re-run the migration and update page, it will not create multiple version in CMS.
Hi, let's say im going to migrate a page from SharePoint CMS to Optimizely CMS. The metadata from the SharePoint CMS page has a published date and modified date. Am I able to override published date and changed date programmatically in Optimizely CMS with the dates from the old CMS?