The calculator is wrong though. Or at least the way you used it is wrong. It counts a "month" as 30 days. But months are ambiguous things. Instead, you should calculate 6 months as March 19, and then count the days from March 19 which is, in fact, 48 days = (6 weeks x 7 + 6 days)

Hence, today is 6 months, 6 weeks, and 6 days from the funeral.