There are two boundary adverbials in Vietnamese which correspond to English until: đến and cho đến. Đến is only compatible with durative predicates, while cho đến is compatible with both durative predicates and punctual predicates under negation. In this paper, I discuss the similarities and differences the two expressions, and their significance for unifying accounts of until. Even in their overlapping durative uses, đến and cho đến behave differently with and without negation. Following Iatridou & Zeijlstra (2021), I assume đến and cho đến introduce a time interval, the UTS, whose right boundary matches its temporal complement. To account for their differences, I propose đến is a universal quantifier over all subintervals of the UTS (Dowty 1979), while cho đến is a temporal exceptive which excludes its right boundary (Alxatib 2024).