Forward foreign exchange trading is an indispensable part of an effective foreign exchange market. The most common delivery periods for foreign exchange forward transactions are 1 month, 2 months, 3 months, 6 months, and 12 months. If the term is long, it is called ultra-forward transaction. The function of forward foreign exchange trading is hedging and preserving value. The agreement to determine its delivery date or effective value date is: 1. Any foreign exchange transaction is based on spot trading, so the forward delivery date is based on spot plus months or weeks. Forward contracts are calculated in days, and the days are based on the calendar days after the spot delivery, not the business days. 2. If the forward delivery date is not a working day, it will be postponed to the next working day. If it is postponed beyond the current month, it must be advanced to the last working day of the current month as the delivery date. 3. "Double bottom" convention. Assuming that the spot delivery date is the last trading day of the month, then the forward delivery date is also the last trading day of the month.