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time->string: choose a more specific format for strftime to avoid y2k warning; more error checking

--- a/meson.build

+++ b/meson.build

@@ -26,7 +26,6 @@

 	'-Wint-to-pointer-cast',

 	'-Wmissing-noreturn',

 	'-Wmissing-prototypes',

-	'-Wno-format-y2k',

 	'-Wpointer-arith',

 	'-Wpointer-to-int-cast',

 	'-Wredundant-decls',

--- a/sys_posix.c

+++ b/sys_posix.c

@@ -31,8 +31,9 @@

 	time_t tme = (time_t)s;

 	struct tm tm;

-	localtime_r(&tme, &tm);

-	strftime(buf, sz, "%c", &tm);

+	*buf = 0;

+	if(localtime_r(&tme, &tm) != nil)

+		strftime(buf, sz, "%a %b %e %H:%M:%S %Y", &tm);

 }

 double