[New-bugs-announce] [issue23718] strptime() can produce invalid date with negative year day

[Serhiy Storchaka]

New submission from Serhiy Storchaka:

strptime() can produce invalid time with negative year day when parse year-week-weekday set. Such time is rejected by strftime(), so strptime/strftime roundtrip doesn't work.

>>> t = time.strptime('2015 0 0', '%Y %U %w')
>>> t
time.struct_time(tm_year=2014, tm_mon=12, tm_mday=28, tm_hour=0, tm_min=0, tm_sec=0, tm_wday=6, tm_yday=-3, tm_isdst=-1)
>>> time.strftime('%Y %U %w', t)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ValueError: day of year out of range

----------
components: Library (Lib)
messages: 238648
nosy: belopolsky, lemburg, serhiy.storchaka
priority: normal
severity: normal
status: open
title: strptime() can produce invalid date with negative year day
type: behavior
versions: Python 2.7, Python 3.4, Python 3.5

_______________________________________
Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue23718>
_______________________________________