Section Editor. Search by createdDate
I don't think there's a significant danger in changing the createdDate/updatedDate field type to date, though I'd still suggest doing so in a test environment where you can test it thoroughly to make sure nothing unintended pops up downstream. Note: it's not possible to change these fields' type through the Section Editor, so you'd need to do so directly in the schema file.
Let me know if you have any other questions!