This is fairly strange and unexplained, magically the New York Mercantile Exchange opened early for trading on Sunday to have trades dated on Tuesday in energy futures?

From the CME Group who owns NYMEX:

We wanted to provide our customers with the opportunity to respond to the storm's potential impact to energy markets as quickly as possible," said CME Group Chief Operating Officer Bryan Durkin. "The ability to trade both our exchange-listed and over-the-counter energy products during this period will be a significant benefit for global energy market participants.