[Python-bugs-list] [ python-Bugs-434143 ] calendar module broken for 1900

[noreply@sourceforge.net]

Bugs item #434143, was opened at 2001-06-18 04:56
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>Category: Python Library
>Group: Platform-specific
Status: Open
Resolution: None
Priority: 5
Submitted By: Alexandre Fayolle (afayolle)
Assigned to: Skip Montanaro (montanaro)
Summary: calendar module broken for 1900

Initial Comment:
Hi there, this is a 'feature' I met on both 1.5.2 and
2.1.

>>> import calendar
>>> calendar.prcal(1865)
Traceback (most recent call last):
  File "<stdin>", line 1, in ?
  File "/usr/lib/python2.1/calendar.py", line 160, in
prcal
    print calendar(year, w, l, c),
  File "/usr/lib/python2.1/calendar.py", line 179, in
calendar
    cal = monthcalendar(year, amonth)
  File "/usr/lib/python2.1/calendar.py", line 85, in
monthcalendar
    day1, ndays = monthrange(year, month)
  File "/usr/lib/python2.1/calendar.py", line 78, in
monthrange
    day1 = weekday(year, month, 1)
  File "/usr/lib/python2.1/calendar.py", line 69, in
weekday
    secs = mktime((year, month, day, 0, 0, 0, 0, 0, 0))
ValueError: year out of range (00-99, 1900-*)

(note that the documentation only refers to 1970 as a
possible limit, and does not mention how dates in 00-99
range are processed)

Now if I try to get the calendar for year 1900 (which
is supposed to work according to the message
hereabove), I get

>>> calendar.prcal(1900)
Traceback (most recent call last):
  File "<stdin>", line 1, in ?
  File "/usr/lib/python2.1/calendar.py", line 160, in
prcal
    print calendar(year, w, l, c),
  File "/usr/lib/python2.1/calendar.py", line 179, in
calendar
    cal = monthcalendar(year, amonth)
  File "/usr/lib/python2.1/calendar.py", line 85, in
monthcalendar
    day1, ndays = monthrange(year, month)
  File "/usr/lib/python2.1/calendar.py", line 78, in
monthrange
    day1 = weekday(year, month, 1)
  File "/usr/lib/python2.1/calendar.py", line 69, in
weekday
    secs = mktime((year, month, day, 0, 0, 0, 0, 0, 0))
OverflowError: mktime argument out of range

I guess this is low priority. 

Cheers 

Alexandre Fayolle


----------------------------------------------------------------------

>Comment By: Skip Montanaro (montanaro)
Date: 2001-07-06 11:40

Message:
Logged In: YES 
user_id=44345

calendar.py is a *very* old module.  Version 1.1 has a date
of 
13-Oct-90.  The message about the ranges almost certainly
comes from the days when Guido and his pals at CWI were 
developing Python on Macs.  I just tried:

    time.mktime((1900,1,1,0,0,0,0,0,0))

on my iMac and it works.  If the year is 1899 it generates
the
traceback.  A year of 1 is currently interpreted as 2001.

I'm not sure this is worth fixing, other than to document
the
limitations better.  If you want to display calendars
perhaps
you should look at Marc-Andre Lemburg's mx.DateTime
module, which supports a much wider range of dates.

Skip
 

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