Mention briefly the provisions relating to date for determination of rate of central excise duty.

As per Rule 5 of the Central Excise Rules, 2002 - The rate of duty or tariff value applicable to any excisable goods, other than khandsari molasses, shall be the rate or value in force on the date when such goods are removed from a factory or a warehouse, as the case may be. The rate of duty in the case of khandsari molasses, shall be the rate in force on the date of receipt of such molasses in the factory of the procurer of such molasses. If any excisable goods are used within the factory, 'the date of removal of such goods' shall mean the date on which the goods are issued for such use.