Dates can be written as month/day/year using integers 1 through 12 for the month, followed by the day of the month, followed by the last two digits of the year. The date 12/ 3/ 45 is an increasing sequence of consecutive digits, while 1/ 22/ 34, 1/ 2/ 35, 1/ 2/ 03 are not. For how many days in one century is the date an increasing sequence of consecutive digits?
1/2/34 works, too.
Unless there are others that we have not counted, there are 8.