while and whilst, conjunction mainly used in UK, can find their equivalents in AmE as during and although. whilst is much more formal. (Middle English whilest, alteration of whiles)
While/whilst/although I accept that he's not perfect in many respects, I do actually quite like the man.
While/whilst/although I fully understand your point of view, I do also have some sympathy with Michael's.
I read it while/whilst/during the time you were drying your hair.
I thought I heard him come in while/whilst/during the time we were having dinner.