I'm giving v12 a trial, I'm used to using v10. In the Tools>Find Files dialog, I see no option to specify date "Created" in search criteria. The default seems to be date "Modified" with no other choices. Surely I don't have to perform an advanced search to do this... ?
There are two tabs in the search window. The second "extended" one is offering the "date .. equal .. modified" setting, you're looking for. You might need to change it from "created" to "modified" in the dropdown menu.
If you do it a lot, you could set up a button that runs Find with a saved filter so you only have to click one button and don't need to open the Find panel or fiddle around with it. Shout if you want that and need any pointers on how to set it up.