Getting a list of running Emacs timers

I've created a timer and stored a reference to it in Emacs with ``` (setq my-timer-store (run-at-time "1 min" 900 'my-func)) ``` I usually execute this elisp in the morning and then stop it from running overnight by executing ``` (cancel-timer my-timer-store) ``` Unfortunately I started the timer twice (without cancelling it in between) so I no longer have a reference to the first one I started and therefore I can't cancel it. Is there a way of listing all the running timers so I can clean up the one I left running.