Du kan ange den 30 juli. Den är giltig "från" det datumet, inte bara efter det datumet.
Från Schengen Visa Code , bilaga VII :
‘FROM ... TO’ heading: This heading indicates the period of the visa holder’s stay as authorised by the visa.
The date from which the visa holder may enter the territory for which the visa is valid is written as below, following the word ‘FROM’: