mtime(p1)
Returns the modification time for the named file as a Time object.
file_name can be an IO object.
File.mtime("testfile") #=> Tue Apr 08 12:58:04 CDT 2003
static VALUE rb_file_s_mtime(VALUE klass, VALUE fname) { struct stat st; if (rb_stat(fname, &st) < 0) { int e = errno; FilePathValue(fname); rb_syserr_fail_path(e, fname); } return stat_mtime(&st); }