Set Cell Range in Formula by referencing Cells

[Timmy Seals]

Help! I'd like to reference cells to define a cell range for a formula.
I'm trying to use a formula to find the minimum value in a range, where the range can be changed outside of the formula by referencing a cell.

For instance if I enter two dates, one in B2 (19/12/2013) and one in B3 (31/12/2013), the formula will only find the minimum value within these dates. Any ideas?

Many thanks, Tim