In foreign exchange trading (FX) a rollover is the action taking place at end of day, where all open positions with value date equals SPOT, will be rolled over to the next business day. This happens since in FX trading the trader doesn’t want to actually buy the traded currencies but to continue to trade until position is closed. For example, on Monday all position with value date of Wednesday (in case of T+1) will be rollover and the value date will be updated for Thursday.