[Fixed]-Django: how to change the choices of AdminTimeWidget

Subclass AdminTimeWidget to include a modified DateTimeShortcuts.js (get to that in a sec), then subclass AdminSplitDateTime to include your subclassed MyAdminTimeWidget instead of the default Django one:

from django.contrib.admin.widgets import AdminTimeWidget
from django.conf import settings

class MyAdminTimeWidget(AdminTimeWidget):
    class Media:
        js = (settings.ADMIN_MEDIA_PREFIX + "js/calendar.js",
              settings.MEDIA_URL + "js/admin/DateTimeShortcuts.js")

class MyAdminSplitDateTime(AdminSplitDateTime):
    def __init__(self, attrs=None):
        widgets = [AdminDateWidget, MyAdminTimeWidget]
        forms.MultiWidget.__init__(self, widgets, attrs)

The secret sauce is in django/contrib/admin/media/js/admin/DateTimeShortcuts.js. This is what creates the list you want to modify. Copy this file and paste it into your project’s site_media/js/admin directory. The relevant code you need to modify is on lines 85-88:

quickElement("a", quickElement("li", time_list, ""), gettext("Now"), "href", "javascript:DateTimeShortcuts.handleClockQuicklink(" + num + ", new Date().strftime('" + time_format + "'));");
quickElement("a", quickElement("li", time_list, ""), gettext("Midnight"), "href", "javascript:DateTimeShortcuts.handleClockQuicklink(" + num + ", new Date(1970,1,1,0,0,0,0).strftime('" + time_format + "'));");
quickElement("a", quickElement("li", time_list, ""), gettext("6 a.m."), "href", "javascript:DateTimeShortcuts.handleClockQuicklink(" + num + ", new Date(1970,1,1,6,0,0,0).strftime('" + time_format + "'));");
quickElement("a", quickElement("li", time_list, ""), gettext("Noon"), "href", "javascript:DateTimeShortcuts.handleClockQuicklink(" + num + ", new Date(1970,1,1,12,0,0,0).strftime('" + time_format + "'));");

Simply add to/delete from/modify that bit of javascript to your heart’s content.

Finally, attach your new widget to any DateTimeFields you like. Your best bet for that will probably be the formfield_overrides attribute on ModelAdmin:

class MyModelAdmin(admin.ModelAdmin):
    formfield_overrides = {
        models.DateTimeField: {'widget': MyAdminSplitDateTime},
    }

I tried using this method and found the above javascript didn’t work when multiple datetime’s were present on the form.

here is what I did.

In my ModelAdmin section i added:

class Media:
    js = ('js/clock_time_selections.js',)

then in the js file:

$('document').ready(function () {
    DateTimeShortcuts.overrideTimeOptions = function () {
        var clockCount = 0;
        console.log('ready');
        $('ul.timelist').each(function () {
            var $this = $(this);
            var originalHref = $this.find('a').attr('href');
            console.log(originalHref);
            $this.find('li').remove();
            for (i=8; i <= 20; i++) {
                var newLink = '<li><a href="javascript:DateTimeShortcuts.handleClockQuicklink('+ clockCount + ', ' + i
                    + ');"> ' + i + ':00h</a></li>';
                $this.append(newLink);
            }
            //console.log($this.html());

            clockCount++;
        });
    };

    addEvent(window, 'load', DateTimeShortcuts.overrideTimeOptions);
});

Note: i had to put inside a document.ready because i found that i couldn’t control where the script was included in the page (seems to have be loaded before the default calendar js files).

There’s better solution. After reading DateTimeShortcuts.js the can be simplified to:

(function ($) {
    $(document).ready(function () {

        DateTimeShortcuts.clockHours.default_ = [];

        for (let hour = 8; hour <= 20; hour++) {
            let verbose_name = new Date(1970, 1, 1, hour, 0, 0).strftime('%H:%M');
            DateTimeShortcuts.clockHours.default_.push([verbose_name, hour])
        }

    });
})(django.jQuery);

Then add this code to the javascript file in ‘static//time-shortcuts.js’ and add Meta to your admin model:

from django.contrib import admin
from .models import MyModel

@admin.register(MyModel)
class MyModelAdmin(admin.ModelAdmin):
    class Media:
        js = [
            '<myapp>/time-shortcuts.js',
        ]

I went with a much simpler approach and it worked for me. I simply added choices to my model using the following code:

class Class(Model):
program = ForeignKey('Program')
time_of_the_day = TimeField(choices=(
(datetime.datetime.strptime('7:00 am', "%I:%M %p").time(), '7:00 am'),
(datetime.datetime.strptime('8:00 am', "%I:%M %p").time(), '8:00 am'),
(datetime.datetime.strptime('9:00 am', "%I:%M %p").time(), '9:00 am'),
(datetime.datetime.strptime('6:00 pm', "%I:%M %p").time(), '6:00 pm'),
(datetime.datetime.strptime('7:00 pm', "%I:%M %p").time(), '7:00 pm'),
(datetime.datetime.strptime('8:00 pm', "%I:%M %p").time(), '8:00 pm'),
(datetime.datetime.strptime('9:00 pm', "%I:%M %p").time(), '9:00 pm'),
))

Hope this helps

Overriding JS by DateTimeShortcuts.overrideTimeOptions function works only with one form
( bug: the change of time in child model affects parent model, so you can’t change timefield in child model form by this widget)

If you want use custom time options with inlines:

in /static/admin/js/admin/DateTimeShortcuts.js
replace:

quickElement("a", quickElement("li", time_list, ""), gettext("Now"), "href",    "javascript:DateTimeShortcuts.handleClockQuicklink(" + num + ", new Date().strftime('" + time_format + "'));");
quickElement("a", quickElement("li", time_list, ""), gettext("Midnight"), "href", "javascript:DateTimeShortcuts.handleClockQuicklink(" + num + ", new Date(1970,1,1,0,0,0,0).strftime('" + time_format + "'));");
quickElement("a", quickElement("li", time_list, ""), gettext("6 a.m."), "href", "javascript:DateTimeShortcuts.handleClockQuicklink(" + num + ", new Date(1970,1,1,6,0,0,0).strftime('" + time_format + "'));");
quickElement("a", quickElement("li", time_list, ""), gettext("Noon"), "href", "javascript:DateTimeShortcuts.handleClockQuicklink(" + num + ", new Date(1970,1,1,12,0,0,0).strftime('" + time_format + "'));");

by:

for(j=6;j<=23;j++){
    quickElement("a", quickElement("li", time_list, ""), j+":00", "href", "javascript:DateTimeShortcuts.handleClockQuicklink(" + num + ", new Date(1970,1,1," + j + ",0,0,0).strftime('" + time_format + "'));");
}

Expanding on @Bit68’s answer, assuming other folks might want to create lists of regularly spaced times more than once, I created a helper function to build a choices tuple. (I’m adding a new answer because this length of code is too hard to follow in a comment.) This works in Django 2.2.

Note that this creates a dropdown list of options, it doesn’t add options to the default admin date/time widget as the javascript methods do.

import datetime

def get_time_choices(start_time=datetime.time(9,0,0), end_time=datetime.time(17,0,0), delta=datetime.timedelta(minutes=15)):
    '''
        Builds a choices tuple of (time object, time string) tuples
        starting at the start time specified and ending at or before 
        the end time specified in increments of size delta.

        The default is to return a choices tuple for 
        9am to 5pm in 15-minute increments.
    '''
    time_choices = ()
    time = start_time
    while time <= end_time:
        time_choices += ((time, time.strftime("%I:%M %p")),)
        # This complicated line is because you can't add
        # a timedelta object to a time object.
        time = (datetime.datetime.combine(datetime.date.today(), time) + delta).time()
    return time_choices

Then time_of_the_day = models.TimeField(choices=get_time_choices())