billing date idala 20 days denawa.example vidihata oya purchase kale 2017-08-01 nam oyage billing date eka 2017-08-31.ethakota oya bill eka settle karanna ona 2017-09-20.ethakota oyata ara dawas 51 labenawa.eath oya purchase karanne 2017-08-30 or 31 nam eath oyage billeng date eka 2017-09-31.ethakotath oya bill eka settle karanna ona 2017-09-20.ethakota oyata dawas 20i labenne.eka depend wenne billing date ekath ekka.