Change date format in Certify signature

If each person could set their own format it will be impossible to know what they mean, and this can be crucial when it comes to digital signatures, so it has to be uniform across all platforms. This format is not the American standard, by the way, which is mm-dd-yyyy, nor the European one, which is dd-mm-yyyy (for the most part). Putting the year up front, followed by the month then the date makes sense as it can be easily compared and sorted (you can do an alphabetical comparison between date strings like that and it works just like a date comparison). This is also the date format used by international standards, such as the UTC.

Not possible.