From accounting point of view, If invoice date is prior to 1st April and material received on or after 1st April upto management specified date (based on practices/policies) and inco terms are Ex-works, then it will form part of GIT.
from GST point of view, ITC can be availed after receipt of goods or services (sec.16) and other conditions as mentioned therein.
If ITC is availed in non-compliance to GST provisions, ITC may be invalidated by deptt. or there are other penalty provisions for fraudulent availment of gst.