At the moment of the millennium change many programmers realized that 99 was going to be bigger than 00 but we do not have a time travel, just a step from 1999 to 2000.
In older systems, such as Windows in versions 1.x, 2.x and 3.x, the problem lies in the omission of digital dictations. In this case, the problem was a bit more complex, since the first second of the year 2000 would be the 1/4/1980 (ie, the year in which MS-DOS was created, the operating system of these Environments).
The main consequence would be that all software that included some date, that is, the majority, would fail.
What if there were problems and the emergency services were affected?
What if the gas did not reach the gas stations?
What if hospitals could not function?
Banking companies could lose data on all customers and bank balances, everyone would see their balance reduced to zero. Transports controlled by computer equipment would not respond, telephones would cease to function, emergency services would collapse.
About 214.634 million euros were spent on ensuring that nothing happened, for some disproportionate expenditure that may have been greater than the losses occasioned.
Here are some of the more curious cases that happened as the year changed:
-In Pennsylvania, a computer in an elementary school library charged the student body excessively for borrowing books for 100 years.
-The mobile communications network of Japan's largest mobile phone operator reported that some mobile phones suppressed new messages, rather than the old ones, when memory was full.
-The national meteorological service, Meteo France, said that an error had caused its website to show a map with the weather report on Saturday 01/01/19100.
-On some websites of transport companies, some packages appeared to have taken 17,101 years (19,100 minus 1999).