format PE GUI 4.0

include 'include\win32a.inc'

section '.code' code readable executable

invoke GetLocalTime, _mytime

invoke wsprintf, _buffer, _prefix, [_mytime.wHour]

invoke MessageBox, 0, _buffer, 0, 0
invoke ExitProcess, 0

section '.data' data readable writeable
_mytime  SYSTEMTIME
_prefix  db "%d", 0
_buffer: times 64 db 0

data import

 library kernel32,'KERNEL32.DLL',\
    user32,'USER32.DLL'

 import user32,\
     wsprintf,'wsprintfA',\
   MessageBox,'MessageBoxA'

 import kernel32,\
        GetLocalTime,'GetLocalTime',\
    ExitProcess,'ExitProcess'

end data
    

movzx  eax, [_mytime.wHour]   ; or maybe movsx
invoke wsprintf, _buffer, _prefix, eax