Selecting Data over a Date Range

I have 2 worksheets where I need to transfer a certain amount of data from one to another depending on dates.
Sheet ‘A’, is the main data source. Col A holds all 365 dates from 1 Jan to 31 Dec(starting at A2), and the subsequent data for each day is held in cols B to P.
Sheet ‘B’ is the destination where the user will specify a key date in cell A3, then in A4 to A32, formulae populate the next 29 dates (ie so there is a continuous run of 30 days).
What I need to do, is to identify the same 30 day range from sheet B on sheet A, then to copy the data in Cols B to P for that range back onto sheet B (pasting in at D3)
Hope this is clear.
Many Thanks.