func abbrev(z *syscall.Timezoneinformation) (std, dst string) {
	stdName := syscall.UTF16ToString(z.StandardName[:])
	a, ok := abbrs[stdName]
	if !ok {
		dstName := syscall.UTF16ToString(z.DaylightName[:])
		// Perhaps stdName is not English. Try to convert it.
		englishName, err := toEnglishName(stdName, dstName)
		if err == nil {
			a, ok = abbrs[englishName]
			if ok {
				return a.std, a.dst
			}
		}