I'm planning to make a killing when somebody unretires me to fix all the issues.. Or maybe not, I hope my retirement accounts are so large I can laugh at their "piddly $500/hr offer".
The hourly pay will be $1200, no less. Thanks to inflation this amount will cover just about the cost of two second-hand teabags and a mouldy lump of bread.
Banks are known for running mainframes which handle dates differently and will not be rolling over. The ones that use unix are likely to 64 bit systems that won't roll over.
This is comparative.