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How to Calculate End Date of Month From Start Date in Salesforce? You need to create a formula field with Date Field Type and use Below formula field. DATE( YEAR(Start_date__c), MONTH(Start_date__c), CASE( MONTH(Start_date__c), 1, 31, 2, IF( MOD( YEAR(Start_date__c), 4) = 0, 29, 28), 3, 31, 4, 30, 5, 31, 6, 30, 7, 31, 8, 31, 9, 30, 10, 31, 11.