How many days in the 20th century were palindromes?

Answer 1

The answer will vary depending on the date format, for example whether you use the international date format (for example 2015-05-14), day-month-year, month-day-year, and whether you use two or four digits for the year.

Answer 2

It is not possible to answer to this question. This is because of the number of different ways in which dates are written. First, there is the US habit order of month-day-year which is at odds with everyone else. Second, there is the question of whether or not the year is shown as a 4-digit or 2-digit string. And finally, there is a question about preceding zeros.

Thus 4 March 1906 can appear as

(non-US)

4-3-06

4-3-1906

04-03-06

04-03-1906

(US)

3-4-06

3-4-1906

03-04-06

03-04-1906

It would be unusual, but feasible, to show the US dates as 03-4-06 or 3-04-06 or even shorten the year to just 6.