Gstr 1 filing date 11th may for april

Yes.You can claim it in the next month and don't claim for April

Dear Vijay Mohan
Due to some technical problem on GST portal , the GSTR 2B is not being generated for April month & In this regard the GSTN as release the Advisory , you can take the ITC As per GSTR 2A for April month.

So advisable kindly check your GSTR-2A instead of GSTR 2B to claim ITC for April's 3B

Yeah. Yesterday GST dept released a notification .

One can claim ITC on self assessment basis , based on GSTR-2A