Is zakat obligatory on money designated for purchasing a personal car, and does the ruling on zakat differ if this designation was made before or after the passing of a full year (hawl)?

The aforementioned money is subject to Zakat if it reaches the [Zakat] threshold by itself or by combining it with other money, provided that full ownership and a complete year [hawl] have been attained. Zakat is not obligatory until a year has passed.