One piece of software I wrote only kept the last digit of the year. For the most part it worked just fine, as I had another table that expanded the last digit to a (get this) a two digit year. That was OK as well. Turns out that the company only lasted around 5 years, but I continued to do some consulting after that.
Yes, it was memory limited, it was the '80s and I was using an 8 bit micro.
Life goes on. I still have a machine close to that one in my garage.