Hi Philip,
Sorry for the delay. I see that you've already found the solution.
There are three options:
1. Change the current culture, e.g.
<%@ Page Culture="en-US" ... %>
2. Change the TimeFormat property, e.g.
<DayPilot:DayPilotMonth TimeFormat="Clock12Hours" ... />
3. Modify the Month.js in the source code (this.drawEvent definition).
See also a related post on turning off the time labels:
http://forums.daypilot.org/Topic.aspx/377/remove_time_from_events_in_month