Django/venv/lib/python3.7/site-packages/django/utils/duration.py

import datetime


def _get_duration_components(duration):
    days = duration.days
    seconds = duration.seconds
    microseconds = duration.microseconds

    minutes = seconds // 60
    seconds = seconds % 60

    hours = minutes // 60
    minutes = minutes % 60

    return days, hours, minutes, seconds, microseconds


def duration_string(duration):
    """Version of str(timedelta) which is not English specific."""
    days, hours, minutes, seconds, microseconds = _get_duration_components(duration)

    string = '{:02d}:{:02d}:{:02d}'.format(hours, minutes, seconds)
    if days:
        string = '{} '.format(days) + string
    if microseconds:
        string += '.{:06d}'.format(microseconds)

    return string


def duration_iso_string(duration):
    if duration < datetime.timedelta(0):
        sign = '-'
        duration *= -1
    else:
        sign = ''

    days, hours, minutes, seconds, microseconds = _get_duration_components(duration)
    ms = '.{:06d}'.format(microseconds) if microseconds else ""
    return '{}P{}DT{:02d}H{:02d}M{:02d}{}S'.format(sign, days, hours, minutes, seconds, ms)


def duration_microseconds(delta):
    return (24 * 60 * 60 * delta.days + delta.seconds) * 1000000 + delta.microseconds