time

[Bryan]

can someone explain to me why i get different values for the tm_yday and
tm_isdst values?
(2004, 3, 1, 1, 3, 59, 0, 0, 0)
(2004, 3, 1, 1, 3, 59, 0, 61, -1)


thanks,

bryan

 

[Steve Holden]

can someone explain to me why i get different values for the tm_yday and
tm_isdst values?

(2004, 3, 1, 1, 3, 59, 0, 0, 0)

(2004, 3, 1, 1, 3, 59, 0, 61, -1)

The trivial answer is "because of differences in the modules". Your
question is a bit like asking "Why is the sky today not the same color
as it was yesterday?"

The docs for the time module explain that for strptime(): """The default
values used to fill in any missing data is [sic] (1900, 1, 1, 0, 0, 0,
0, 1, -1)""" and """Support for the %Z directive is based on the values
contained in tzname and whether daylight is true. Because of this, it is
platform-specific except for recognizing UTC and GMT which are always
known (and are considered to be non-daylight savings timezones). """

Note that strptime used only to be present if your platform's C library
provided it; though I can't say for sure that's changed I believe it
has. No idea when, though.

The rfc822 docs for parsedate, on the other hand, specifically remark
"""Note that fields 6, 7, and 8 of the result tuple are not usable.""".

So I suspect you are simply being disturbed by the lack of a consistency
that was never intended to exist: you reads the docs and makes yer
choice - ultimately, do what works in your application.

carefully-not-mentioning-hobgoblins-ly y'rs - steve

 

[Gerrit]

The trivial answer is "because of differences in the modules". Your
question is a bit like asking "Why is the sky today not the same color
as it was yesterday?"

See also:

http://www.python.org/sf/748843

Gerrit.

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[Michele Simionato]

can someone explain to me why i get different values for the tm_yday and
tm_isdst values?

(2004, 3, 1, 1, 3, 59, 0, 0, 0)

(2004, 3, 1, 1, 3, 59, 0, 61, -1)


thanks,

bryan

I asked a similar question just few days ago. Here is the answer:
(2004, 3, 1, 1, 3, 59, 0, 61, 0)

Michele Simionato

 

[Alex Martelli]

Note that strptime used only to be present if your platform's C library
provided it; though I can't say for sure that's changed I believe it
has. No idea when, though.

It's changed with 2.3 (thanks to Brett Cannon, who submitted his
pure-Python implementation of strptime, first published in the 1st
edition of the "Python Cookbook").


Alex