For those who have probably forgotten that the due date for  submission was last Wednesday, I am giving you an opportunity to be heard until cob today.

这个句子中就是这个COB不太懂，我猜到是下班之前，但是不知道是哪几个字母的缩写？
是否有个典故呢？

伊森：End Of Day, End of Business, Close of Business or COB is the end of the trading day in financial markets, the point when trading ceases. 
 
猫猫 CLOSE OF BUSINESS -- meaning at the end of the business hours.（ 交易结束）

翻译达人COB: Close of Business： 工作日结束时