Potential bug found.

I opened qalendar via the stock calendar widget (I am using Background Tweak).
It opened in agenda view but the date at the top was from the last time I opened qalendar (Thursday). This means that you have to correct the date to set an alarm for later in the day.
To get the date correct in agenda view I selected Month view and then Agenda again. Will need to test it again tomorrow to see if I can reproduce.

Edit -- It can be reproduced, even after a reboot on version 0.6.1.

Addition comments, the Alarm view isn't obvious that you are selecting hours/minutes/seconds before the event. It was only after putting the exact time of the alarm that I remembered how the stock calender worked.