Search string query question to find things in that date time only?

I have been trying to create a search string that will find me something released only only a certain date for newly released items but i'm still getting a wide range of release dates.

I have the first part of the string worked out but I tried many variations for the date part that I have found on the internet but nothing seems to work.

Does anyone know if there is a part of a search string that will find only items from that date please?
I have tried "Date available from 27 September 2018" "Release date 27 September" "27/09/2018" "created\>=020/09/2018" and used [ ] for all these terms as well and on verbatim search, advanced search plus another 20 variations and string types I have seen on various sites but it just ain't happening for me.

Use tools section of your search results page

Thank you but it shows some from the last 24 hrs when I choose that in the tools just like the advanced search does but it also shows things from 6th of September and many other release dates.
Maybe it's the site i'm searching holding them back by de-indexing them until they back in stock and then re-indexing them when they are back in so Googl is showing them as last 24hrs.