Negative xsd:duration decoded as days instead of seconds #1492

Description

Duration.pythonvalue (src/zeep/xsd/types/builtins.py) decodes a negative xsd:duration with the wrong unit. isodate cannot parse a negative time component, so the code strips the minus, parses the positive duration, and negates it:

if value.startswith("PT-"):
    value = value.replace("PT-", "PT")
    result = isodate.parse_duration(value)
    return datetime.timedelta(0 - result.total_seconds())

timedelta's first positional argument is days, not seconds. result.total_seconds() (a seconds count) is passed as days, so the result is off by a factor of 86400. PT-30S decodes to -30 days instead of -30 seconds.

Steps to Reproduce

from zeep.xsd.types import builtins
d = builtins.Duration()
print(d.pythonvalue("PT-30S"))                 # -30 days, 0:00:00
print(d.pythonvalue("PT-30S").total_seconds()) # -2592000.0

Expected Behavior

PT-30S decodes to datetime.timedelta(seconds=-30) (-30.0 seconds).

Fix

Pass the value as seconds=:

return datetime.timedelta(seconds=0 - result.total_seconds())