Let's take a look at a couple of scenarios and help you with your concern.
Before we start, may I know what specific report you're trying to run? Any additional information would be greatly appreciated.
If you're trying to run the Account List report, you don't have to option to customize the date from there. But the total amounts of each account will show on that report.
However, if you're trying to run and customize different reports that show the accounts, you'll have to make sure that the account has a balance on the customized date of the report. It's the possible reason why accounts don't show.