Two objections have been raised to the proposed datetime.localtime() function:

1. It offers the third subtly different way to obtain current time in datetime module.  The first two being provided by datetime.now() and datetime.today().

2. C library localtime function takes POSIX timestamp as an argument, so datetime.localtime() should follow suit.

I attach a prototype patch for a different approach: make datetime.astimezone() method supply local timezone information if no argument is given.

This patch also demonstrates that extracting all TZ information that platform may have knowledge of is not trivial.