Works on Siri! You can even set – get this – multiple timers ;)
The one caveat is that once the timer you want is two and a half hours or longer, then Siri replies by asking what you would like to convert to.
As for, "What time is it?"... Try activating Siri and only saying, "Time."
And thinking back over it, more than half the failures are complete - e.g., it likely never activated at all. Very few are "it set a timer, but for the wrong time".