Function parse_duration

django/utils/dateparse.py:133–155

Parse a duration string and return a datetime.timedelta. The preferred format for durations in Django is '%d %H:%M:%S.%f'. Also supports ISO 8601 representation (excluding years and months) and PostgreSQL's day-time interval format.

(value)

def parse_duration(value):
    """Parse a duration string and return a datetime.timedelta.

    The preferred format for durations in Django is '%d %H:%M:%S.%f'.

    Also supports ISO 8601 representation (excluding years and months) and
    PostgreSQL's day-time interval format.
    """
    match = (
        standard_duration_re.match(value)
        or iso8601_duration_re.match(value)
        or postgres_interval_re.match(value)
    )
    if match:
        kw = match.groupdict()
        sign = -1 if kw.pop("sign", "+") == "-" else 1
        if kw.get("microseconds"):
            kw["microseconds"] = kw["microseconds"].ljust(6, "0")
        kw = {k: float(v.replace(",", ".")) for k, v in kw.items() if v is not None}
        days = datetime.timedelta(kw.pop("days", 0.0) or 0.0)
        if match.re == iso8601_duration_re:
            days *= sign
        return days + sign * datetime.timedelta(**kw)