GST Consequences of late filing

suppose I have purchased something from a registered dealer. now I m entitled to credit. now the dealer did not file his gstr 1 by 15th of next month. now does that mean I won't be able to take credit of inputs and file my gstr 2 by due date? and wat r the consequences dealer has to bear if he files all his return late i.e after 15 or so.
please ne1 guide