add data from other sheets within a period (week)

hello
i have a workbook which contains 31 sheets, one for each day, and Total sheet.
i want to create results (add values from cells from different sheets) for a given week (or period of days), which the user inputs.
for example week from 21.12 to 27.12. so this selects sheets from 21th to 27th sheet

i attached an example file containing just 3 days and the total
could you please help me with it?
Thank you!