New Delhi, May 17 -- Nasdaq is moving closer to around-the-clock stock trading, as SEC last month approved its proposal to extend its trading hours for NMS stocks and exchange-traded products. If implemented, this move could prompt other exchanges to follow suit.

Nasdaq, whose flagship eponymous exchange host some of the world's largest technology ​companies, expects the expanded trading to begin ​on December 6, subject to regulatory approvals.

But the critical question is, when it come to round-the-clock trading how do markets determine the end of one trading day and the start of the next?

A Tabforum article explains it should not be midnight. Stock markets around the world operate on different schedules. When it is midnig...