Debate over longest bull market centers on rounding

It could become the longest bull market ever … perhaps with an asterisk.
S&P Dow Jones Indices, which compiles the benchmark S&P 500 index, and other research firms say the current bull market that began on March 9, 2009, is on track to become the longest in history on Wednesday, at 3,453 days.
Other market analysts say not so fast. They say this bull market would have to run until June 2021 to set the record, claiming the longest bull market ran 4,494 days between Dec. 4, 1987, a