What if bill is generated on 29th june and but????

as i see it is normal that the bills raised on the last day of month the delivery will be practically in next month. under present Pre GST regime

it is correct and no worry.

But in Post GST regime when e bill is introduced there are time limit fixed for transportation and we need to followup for its safe delivery

and the buyer has to confirm in the return GSTR 1A 

Thanks Mr. Umesh