Sprawdź kalendarz, jeśli miesiąc to 30 dni
if( 0x0A50 & (1<<month) != 0 )
//(month==4||month==6||month==9||month==11) is perfectly ok
Zany Zebra
if( 0x0A50 & (1<<month) != 0 )
//(month==4||month==6||month==9||month==11) is perfectly ok