Article 3 of the GCC Common VAT Agreement mandates a uniform method for calculating all time-related stipulations within the framework. It specifies that all dates and timeframes mentioned in the Agreement must be calculated exclusively according to the Gregorian Calendar. This provision ensures consistency and legal certainty across all Member States when determining tax periods, due dates for VAT returns, payment deadlines, and any other time-sensitive obligations or rights. By establishing a single, universally understood calendar system, the Article prevents ambiguity and simplifies tax administration and compliance for businesses operating within the GCC economic bloc.