timeFormat

Determines the time-text that will be displayed on each event.

'h:mm'    // like '5:00', for agendaWeek and agendaDay
'h(:mm)t' // like '7p', for all other views

As noted above, each view has a specific default. Get fine-tuned control with View-Specific Options. A single string alone will set the value for all views.

The default values will change based on the current locale.

Time-text will only be displayed for Event Objects that have allDay equal to false.

Here is an example of displaying all events in a 24-hour format:

$('#calendar').fullCalendar({
  events: [
    {
      title:  'My Event',
      start:  '2010-01-01T14:30:00',
      allDay: false
    }
    // other events here...
  ],
  timeFormat: 'H(:mm)' // uppercase H for 24-hour clock
});