Days of the Week

[Reboot]

This is where we start talking about whether 199X means somewhere between 1990 and 1999 or if it means 2000, right?

Nah, x stands for an unknown digit, which means those first three digits are known to be 1, 9 and 9 in that order.

Now, if you're talking about the end of the 20th century, that should absolutely be the 31st of December 2000, not 1999...