Re: [Chicken-janitors] #1014: posix: string->time preserves the year accross multiple invocations

[Chicken Trac]

#1014: posix: string->time preserves the year accross multiple invocations
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  Reporter:  certainty       |       Owner:         
      Type:  defect          |      Status:  new    
  Priority:  major           |   Milestone:  someday
 Component:  core libraries  |     Version:  4.8.x  
Resolution:                  |    Keywords:         
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Comment(by zbigniew):

 This is technically a misuse of strptime, as you shouldn't retrieve fields
 you haven't set.

 One option is to init the struct to the current date, which makes
 everything relative to today.  This is annoying to implement and not
 always what you want.

 Instead I suggest behaving like python: init the struct to 1900/01/01
 00:00:00.

 The problem is strptime behaves differently on different platforms: for
 example on OS X, it won't update the weekday or day of year, whereas it
 does on glibc.

 So, the attached patch also uses mktime to ensure week/year day is set.
 Note that this may, or may not, cause the time to be interpreted as local
 time.  On the other hand, parsing timezones with strptime is hit and miss
 anyway -- on OS X the only legal timezones are the local TZ and "GMT"
 (everything else bombs out).

 mktime() is a bit of a question mark, I'd want to see testing on a few
 platforms before applying it.  It can be removed, with the caveat that
 weekday will be wrong as mentioned above.

-- 
Ticket URL: <http://bugs.call-cc.org/ticket/1014#comment:2>
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