Flextime / Company flexible working time accounts balance shows you the situation of actual hours registered depending on your search filters. If you are using Silverbucket's Timesheet feature, this report is useful for tracking personnel's flex hours.

In the screenshot below person named Help & Manual User has been working +11,3 hours overtime so far, as the report shows.

Filtering with an end date allows you to see how a situation is/was at a specific date.
This field might explain situations where the flextime is locked at a certain amount / shows too much or too little, so make sure this is set correctly for your needs (blank field = today).