While many of us normally abbreviate years, for example by writing 2019 as “19”, doing so in 2020 can be dangerous.
Because the last two digits of the date, “20”, are also the first two digits of the current century, writing just “20” allows people to modify the date backwards or forwards with a great deal of ease. When it comes to cheques (which I know are becoming rarer!) and other important documents, it can be dangerous, and lead to fraud.
Unscrupulous folks can easily change dates to earlier dates. If you sign an agreement that requires you to make annual payments starting one year after the date of the contact, for example, and you date the agreement “1/6/20,” the counterparty could easily add “19” to the end of the date and demand that you make the first payment immediately, since the agreement commenced on “1/6/2019.”
Likewise, crooks can modify dates forwards. If you were the lender in the aforementioned example, the borrower could change “1/6/20” to “1/6/2021” or some later date, and refuse to pay you when the first payment, or first series of payments, should have become due.
Can we therefore encourage you to not abbreviate the year in 2020 and write it in full.