11/12/13 one of last sequential dates of 21st century

11/12/13 one of last sequential dates of 21st century
When shown as month-day-year, there is only one more sequential date this century. When shown as day-month-year, the last sequential date of the century is next month.

EUGENE, Ore. - It's 11/12/13!

Unless you live in the parts of the world where dates are expressed day-month-year, in which case 11/12/13 comes next month on December 11, 2013.

Either way, sequential dates are rare, according to Aziz S. Inan, professor of electrical engineering at the University of Portland.

When it comes to dates expressed as month-day-year, "each century contains 12 such sequential number calendar dates, the first being 01-02-03 and the last one 12-13-14," Inan wrote last week. "December 13, 2014, will be the last such sequential calendar date in the 21st century."

Europe and other parts of the world express the date day-month-year instead of month-day-year. There are only 11 such date sequences in each century, Inan wrote.

"Interestingly enough, sequential calendar date 11-12-13 always coincides with the 345th day of its year," Inan said of day-month-year sequences, "where digits 3,4 and 5 also form a sequential series."

NEED MORE NUMBERS? Inan plays with numbers and shares what he finds on his faculty webpage under "Inan's Selective Publicaitons."

For example, Hillary Clinton turned 66 this year, sparking Inan's curiosity.

"Clinton turned 44 and 55 in palindrome years 1991 and 2002," he wrote. "If Clinton’s birth year 1947 is split as 19 and 47, these two numbers also add up to 66"