The general rule of trading days in 2018 says that it reduces twice on the first and the last Sunday of the month twice. However, this month is the special month of December
Trade Sunday Will the stores be open on December 23?
In December 2018, the number of business days doubled due to the Christmas season this month. Due to the crazy madness of a merchant's Sunday shopping in December this year. It falls four times.
One of these business days of this month is December 23. The shops are open on New Year's Eve and Sunday December 30th. However, remember that, since January 2019, shopping will be on Sunday only on the last Sunday of the month.