Change our timestamp format/parsing functions to not use strftime(3)/strptime(3) to avoid getting tangled up in the LOCALE.
Change our timestamp format/parsing functions to not use
strftime(3)/strptime(3) to avoid getting tangled up in the LOCALE.

We're not out of the LOCALE-tangle yet, but this was the big part.

Inspired by patches from:	Dridi Boukelmoune

feld/Varnish-Cache,varnish/Varnish-Cache,gauthier-delacroix/Varnish-Cache,franciscovg/Varnish-Cache,chrismoulton/Varnish-Cache,feld/Varnish-Cache,gauthier-delacroix/Varnish-Cache,gauthier-delacroix/Varnish-Cache,feld/Varnish-Cache,ajasty-cavium/Varnish-Cache,zhoualbeart/Varnish-Cache,mrhmouse/Varnish-Cache,franciscovg/Varnish-Cache,zhoualbeart/Varnish-Cache,zhoualbeart/Varnish-Cache,gquintard/Varnish-Cache,feld/Varnish-Cache,gauthier-delacroix/Varnish-Cache,gquintard/Varnish-Cache,franciscovg/Varnish-Cache,mrhmouse/Varnish-Cache,ajasty-cavium/Varnish-Cache,franciscovg/Varnish-Cache,varnish/Varnish-Cache,mrhmouse/Varnish-Cache,gquintard/Varnish-Cache,zhoualbeart/Varnish-Cache,zhoualbeart/Varnish-Cache,chrismoulton/Varnish-Cache,varnish/Varnish-Cache,chrismoulton/Varnish-Cache,ajasty-cavium/Varnish-Cache,feld/Varnish-Cache,mrhmouse/Varnish-Cache,franciscovg/Varnish-Cache,gauthier-delacroix/Varnish-Cache,chrismoulton/Varnish-Cache,mrhmouse/Varnish-Cache,varnish/Varnish-Cache,ajasty-cavium/Varnish-Cache,ajasty-cavium/Varnish-Cache,varnish/Varnish-Cache,chrismoulton/Varnish-Cache,gquintard/Varnish-Cache