Purchase bills of July,18 can be book later on?

my purchase bills if booked later on than the month of bill, GST input will reflect in the month of booking.

But my supplier have shown in their return...GST output in the month of its sale..

if on my GST portal GST input is shown in different month...does my co. will get GST input in the month of return filling?

So is it OK if I will book purchase bills later on than the month of bill?

pl.clarify.