问题
I'm the author of the Mac::PropertyList module which parses the Apple property list format. I've designed this to work across platforms, but I'm having trouble with POSIX's strftime function which I use to create the date fields in the format that Apple specifies.
use POSIX;
print 'Epoch is: ' . POSIX::strftime( "%FT%H:%M:%SZ\n", gmtime(978307200) );
On unix-like platforms, including darwin, this call produces the right sort of date:
2013-09-23T12:34:56Z
On Windows, it produces:
T12:34:56Z
This was reported as CPAN RT #83460. What's going on with Windows here?
回答1:
As I was writing this question and researching everything, I found my own answer. I don't want all that work to go to waste though.
The %F format I used is not portable, and the POSIX module says in its strftime entry:
If you want your code to be portable, your format ("fmt")
argument should use only the conversion specifiers defined by
the ANSI C standard (C89, to play safe). These are
"aAbBcdHIjmMpSUwWxXyYZ%".
%F is really %Y-%m-%d, so I should use that.
My particular problem is that I know that the POSIX module tells you which format specifiers you can use to be portable, but I still have to look at the strftime man page to see what they do. In looking at the man page, I forget to check which ones are portable.
来源：https://stackoverflow.com/questions/18970859/why-does-perls-posixstrftime-f-specifier-not-work-on-windows