born very roughly 1584
died 15–29 October 1645
in Blaisdon, Gloucestershire
According to Reg Chamberlain: buried 29th October 1645 in Westbury-on-Severn.
Looking through the LDS records for Harts in Blaisdon shows one Wyllyam Hart recorded as father (no mother's name given) at the baptism of Antony Hart (1612) and Harry Hart (1617). That suggests that William's birth would not have been later than 1594.
forest-of-dean.net has a record of the burial of one William Hart on 29 October 1645 in Blaisdon.