No option to change game start date after downloading databse

The updated signings are there when I load up a save, however it doesn't give me an option other than the selected nations for a later date and start time 

You may be thinking of the Future Start Date Database which we haven't released for FM23 because I haven't had time. This is different to the main Data Update.

 A few members on the forums have been working on their own you can try here: https://sortitoutsi.net/content/61363/real-premier-league-fixtures-and-carabao-cup-fix 

There is also a start date only file made by @kingrobbo available at FMRTE: https://www.fmrte.com/forums/topic/9929-weekly-custom-start-date-fm23-build-7-300123-older-builds-also-included-pm-for-download/