This subclass of django.models.Field stores a python datetime.timedelta object as an integer column in the database. It includes a TimedeltaFormField for editing it through djangos admin interface. Feedback welcome. 2011-04-20: TimedeltaField can now be (de)serialized. Tested with JSON. 2009-11-23: `_has_changed()` added. Before form.changed_data contained timedelta FormFields, even if nothing changed.
Django does not have a suitable model field can process time type in mysql, the DateTimeField built-in django can not process more than 24 hours. That's why the code born. **Simply usage** `from myapp.models import TimeAsTimeDeltaField, SECONDS_PER_MIN, SECONDS_PER_HOUR, SECONDS_PER_DAY class EstimatedTime: days = None hours = None minutes = None seconds = None class Case(models.Model): estimated_time = TimeAsTimeDeltaField(null=True, blank=True) def get_estimated_time(self): estimated_time = EstimatedTime() if self.estimated_time: total_seconds = self.estimated_time.seconds + (self.estimated_time.days * SECONDS_PER_DAY) days = total_seconds / SECONDS_PER_DAY hours = total_seconds / SECONDS_PER_HOUR - days * 24 minutes = total_seconds / SECONDS_PER_MIN - hours * 60 - days * 24 * 60 seconds = total_seconds % SECONDS_PER_MIN estimated_time.days = days estimated_time.hours = hours estimated_time.minutes = minutes estimated_time.seconds = seconds return estimated_time else: return estimated_time