Missing outward supply bills belongs to previous month, when uploaded in the current month, then what could be the bills dates appear in the current month GSRT1 return, of the previous month bills , say for example Bill NO. 1 dated 05-08-2018 and Bill no. 2 dated 16-08-2018, are the missing invoices for the month of August, but I would like to upload in the month of September 2018, now my question is that whether GSTR1 return for the month of september month, dates of august -will it be accepted or by default will it become 01-09-2018. kindly clarify.