Allow Team Calendar events to be entered in 12 hour time

We are a US-based company, and it seems to be impossible to change the Event entry screen time field to anything but 24 hour entry. It does the conversion to 12 hour (am/pm) time once it's entered, so it should be possible to enter events as (1:15 pm) instead of having to mentally convert it to (13:15). This will be a huge barrier to Team Calendars adoption for our company.