Akkadian

adi - up to, as far as; until, up to (connoting time); concerning, as to (CAD A₁ 115, AHw. 12)

Also adu, gadu, ḳаdu, ḫadu, ad. The background of variants with initial ḳ and g is difficult to establish.

PS
*ˁaday - up to, until (Arakelova 2001:21)