One of our readers has wisely pointed out an interesting flaw when writing the date in 2020. The reader has advised everyone to write the year in its entirety. It could possibly protect you and prevent legal issues on paperwork.
For example, if you just write 1/1/20, one could easily change it to 1/1/2017 (for instance) and now your signature is on an incorrect document.
A friendly reminder as we have now entered a new decade!