Hour widget django

widgets.py

from django import forms

TIME_CHOICES = [('', '--------')]
for i in range(0, 24):
    for m in ["00", "30"]:
        hour = i % 12
        if i == 12:
            hour = 12
        TIME_CHOICES.append(
            ("%02d:%s" % (i, m),
             "%02d:%s " % (hour, m) + ((i < 12) and "am" or "pm")))

class SelectTimeInput(forms.Select):
    format = '%H:%M'

    def __init__(self, attrs=None, choices=()):
        if not choices:
            choices = TIME_CHOICES
        else:
            choices = list(choices)
        super(SelectTimeInput, self).__init__(attrs, choices)

    def render_options(self, choices, selected_choices):
        def convert_choices(v):
            if hasattr(v, 'strftime'):
                v = v.strftime(self.format)
            return v
        selected_choices = map(convert_choices, selected_choices)
        return super(SelectTimeInput, self).render_options(
            choices,
            selected_choices)