How to Enter New Tasks in the Outlook 2013 Tasks Module
(Optional) Enter the time you want to activate the reminder in the time box.
The easiest way to set a time is to type the numbers for the time. You don’t need colons or anything special. If you want to finish by 2:35 p.m., just type 235. Outlook assumes that you’re not a vampire — it schedules your tasks and appointments during daylight hours unless you say otherwise.
(If you are a vampire, type 235a, and Outlook translates that to 2:35 a.m. If you simply must use correct punctuation, Outlook can handle that, too.)