Reports Over Time?

[Michael Iles]

I'm looking for a report that shows account balances over time, e.g.
like the 'Balance Sheet' report but with an option to show the
balances monthly, quarterly, etc.

Maybe I'm blind but I can't seem to find it. The 'Average Balance'
report has 'start date', 'end date', 'step size' options, which is
what I want, but 'Balance Sheet' doesn't have these options.

Is it possible to add the 'step size' option to the 'Balance Sheet' report?

Thanks,
Mike