The developers would have used an existing library common to many PHP uses. 1900 is not that long ago - even now there is a lady out there born in 1903 and I can see an ID application which requires the date of birth of your parents. If anything , the range is too small and that will be based on the amount of space in bits required to store a date. One bit less and you won't cover a big enough range.
The whole Y2K problem was built around this - code was built with only 2 digits for a year. Seemed perfectly smart in the early seventies and what programmer them was thinking their code would still being used in the distant 21st century?
The whole Y2K problem was built around this - code was built with only 2 digits for a year. Seemed perfectly smart in the early seventies and what programmer them was thinking their code would still being used in the distant 21st century?