请问 汇率按照汇款当天计算 英语怎么说？

The exchange rate is calculated by the day of the remittance.

以上所有款项均按美元计算。若缴纳人民币，按中国银行当日美元汇率中间价计算。
Above sum is charged in USD. If in RMB, the Exchange Rate is in according to the bank's offer on the paying day.

这句中文本身就不明确
The specific exchange rate depends on the exact remittance day.
简洁明了.

The Forex Rate is caculated according to the transaction day.

Calculated by the intraday exchange rate.

The exchange rate is calculated depent on the day you transfer