There is a big difference of monetary value between the nisab amount of gold and nisab amount of silver in our country. So on which basis should we calculate the nisab?
The threshold (nisab) of money is the value of 595 grams of silver which is about 300$. You try and set a date and on that day, you calculate how much you have and give 2.5% in zakat. Every lunar year, you do this process on that date.