24 hour time format (so no AM to PM) for fullCalendar

This option works now for me in fullCalendar v2 :

slotLabelFormat:"HH:mm"

http://fullcalendar.io/docs/agenda/slotLabelFormat/

You want to set the layout to 24 hour system or the events.

If you want to add to the events, put like 22:00 'party' then add timeFormat: 'H:mm' , to your json.php file.

eventDrop: function (event, delta) {
        alert(event.title + ' was moved ' + delta + ' days\n' +
            '(should probably update your database)');
},
timeFormat: 'H:mm',

If you want to change the layout of your calendar then just go to your fullCalendar.js

Look up:

setDefaults

And change your code like the following.

setDefaults({
    allDaySlot: true,
    allDayText: 'Volledige dag',
    firstHour: 8,
    slotMinutes: 30,
    defaultEventMinutes: 120,
    axisFormat: 'HH:mm',
    timeFormat: {
        agenda: 'H:mm{ - h:mm}'
    },
    dragOpacity: {
        agenda: .5
    },
    minTime: 0,
    maxTime: 24
});