Thanks for the reminder Eryk Sun.  This means the test needs to be run yet one more time :)

import ctypes, locale, struct
crt_time = ctypes.CDLL('api-ms-win-crt-time-l1-1-0', use_errno=True)
locale.setlocale(locale.LC_ALL, 'de_DE')
buf = ctypes.create_string_buffer(1024)
tm = struct.pack('9i', 2019, 5, 6, 9, 50, 4, 0, 126, 1)
print('count:', crt_time.strftime(buf, 1024, b'%Z', tm))
print('value:', buf.value)
wbuf = ctypes.create_unicode_buffer(1024)
print('count:', crt_time.wcsftime(wbuf, 1024, '%Z', tm))
print('value:', wbuf.value)
crt_convert = ctypes.CDLL('api-ms-win-crt-convert-l1-1-0', use_errno=True)
print('count:', crt_convert.mbstowcs(wbuf, buf, 1024))
print('value:', wbuf.value)