Does Sundial of the Infinite end triggered abilities that are still on the stack if activated at end of turn?

Sundial of the Infinite reads: '{1}, {T}: End the turn. Activate only during your turn.' When you activate it, the game immediately moves to the cleanup step in a special way defined by CR 718 (Ending the Turn).

CR 718.1 states that when an effect ends the turn, the following things happen in order: (1) all spells and abilities on the stack are exiled (they don't resolve and don't go to any graveyard), (2) the current phase and step end, (3) any triggers that would trigger from this process are ignored, and (4) the game moves to the cleanup step.

This means any triggered ability sitting on the stack — whether it triggered at the beginning of the end step or at any other point — is simply exiled and never resolves. This is a common and powerful interaction used to cancel 'at the beginning of your next end step' delayed triggers or 'at the beginning of the end step' upkeep-style punish triggers.

Concrete example: You control a creature enchanted with Haunted Cloak and you attacked, putting a 'destroy this creature at end of turn' delayed trigger on the stack during your end step. You activate Sundial of the Infinite. That destruction trigger is exiled and never resolves — your creature survives.

Note: CR 718.1 also clarifies that even if new triggered abilities would trigger from the act of ending the turn, those are also ignored. You cannot 'respond' to Sundial in the sense of adding new triggers that sneak in before the stack is cleared — the entire process is a single game action.