Agents know what day it is
Ask an assistant what day it is and it used to answer from whatever its training data suggested — confidently, and often days off. Nothing in the pipeline ever told it the date, and it had no clock to consult, so there was no way for it to be right.
Every turn now ships the current date and time as part of the agent's context. That matters well beyond the question itself: a scheduling or mail assistant resolves "tomorrow", "next Tuesday afternoon" or "clear my Friday" against an anchor date, and a wrong anchor books meetings on wrong days without anything looking broken.
The date is shown in your time zone, taken from your profile, so "today" is your day rather than UTC's — which are genuinely different days for anyone whose evening falls after midnight in London. Alongside it the agent gets the same moment in UTC, in the machine-readable form it should use when it writes a timestamp back into a calendar entry or a document.
Because the clock is stamped on each turn rather than baked into an assistant when it is first loaded, a conversation you come back to next week gets next week's date — not the date it was started on.