https://learn.microsoft.com/en-us/windows/win32/api/wuapi/nf-wuapi-iupdate-get_lastdeploymentchangetime
IUpdate::get_LastDeploymentChangeTime (wuapi.h) - Win32 apps | Microsoft Learn
Gets the last published date of the update, in Coordinated Universal Time (UTC) date and time, on the server that deploys the update.
iupdategethappsmicrosoft