BT Pes 8b(15) :בני בירב דדירי בבאגא מהו למיתא חשכא וק̇ד̇מא לבירב‏ : should the students of the be rav who dwell in the rural district come to the be rav at dusk and at dawn?
See the entire entry for ḥaškā, ḥaškəṯā n.f. dusk

BT Pes 8b(15) :למיתא חשכא וק̇ד̇מא לבירב‏ : to come to the academy night and day
See the entire entry for qdmh#2 n.f. early state; dawn