First, you can bring your ID card directly to the foreign counter to handle related business. If the relevant bank card has online banking, you can also handle related business through online banking. In addition, I would also like to remind you that there is no handling fee for RMB exchange in the bank. The exchange rate cost of the bank is directly calculated in the exchange rate and converted according to the real-time quotation of the bank. Every working day, the People's Bank of China will announce the official foreign exchange rate (exchange rate) of China, and the head offices of commercial banks will take this as the middle price.
2. Within the scope allowed by the People's Bank of China, floating a certain number of points up and down to determine the foreign exchange quotation of the bank on that day, so different banks have different quotations. If the exchange amount is large, it is recommended that you make more comparisons before exchange.
Whether you can exchange foreign exchange (Japanese yen) depends on the business hours of the bank you go to. If the bank is open on weekends, it will be open as usual. Of course, it depends on whether the bank has foreign exchange business and the foreign exchange reserves of the branches of the bank you go to. As far as I know, most branches of Bank of China and Industrial and Commercial Bank of China are open on Saturdays and closed on Sundays, but the business hours of Bank of China seem to end earlier than usual, ending at 4 pm, so go early.
Third, you'd better make an appointment in advance, because the foreign exchange reserves of each branch may not be sufficient, so as to ensure the exchange. Besides, I don't know if you have changed some foreign exchange. Each person has a foreign exchange quota equivalent to RMB 50,000 per year. If you exceed this amount, it seems that you have to declare something else. Anyway, I haven't changed my quota. This refers to all the people with the same ID card at the time of exchange. For example, if you exchange RMB 50,000 for foreign currency, your father still has a quota of RMB 50,000.
The yen fluctuates to some extent. Pay attention to the exchange rate when changing, there may be great differences on the day, especially if you change a lot. Generally, the exchange rate of ICBC is slightly better than that of Bank of China, which I found in practice (online said that the exchange rate of Bank of China is the best, but it is not real-time). You can pay attention to the market. Silly, I once thought that banks in China should unify the exchange rate, including bank interest rates, but later I found that there were still differences. The bank interest rate used to be the same (well, I am an unearthed cultural relic). Of course, the exchange rate difference between banks in China is not very big (you changed it)