It would be very helpful if it were possible to enter relative date coordinates. For example, I would like to customize an expense barchart that shows me the expenses, in day-resolution, of the last seven days. There is no way to articulate something like "the last seven days".

There are some limited relative date entry options like "Start of this months", "Start of previous months"... why not make this more general? I.e. "X days before today", "X days after today".

"Today" meaning: the day when the report is run.

This would allow for much flexibility in customizing reports, which can then be simply run without modifying them again and again in the future..