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17-Oct-23 : Revision in the time limit of UDIN generation in phased manner; 28-Sep-21 : Aligning the time limit of generating UDIN to 60 days by substituting the existing time limit of 15 days. 1-Dec-20 : FAQs on Unique Document Identification Number (UDIN) 26-Aug-19 : The use of UDIN will be mandatory from 1 st October, 2019. cara login akun simpatika