Programmers run both versions of their data through their computer system to make sure all calculations are done correctly. Often the data aging tool must be told how to handle certain dates, like paychecks that are issued on the second and fourth Fridays of the month and the fact that Thanksgiving always falls on Thursday. Date simulation simply means that the program makes the computer pretend it is in the 21st century. Cap Gemini's Woodward says that testing can eat up a lot time in a Y2K project. When the remediation phase is finished, people often have false hope about their progress then discover most of the hard work is still ahead.
Many companies think they're done before they start testing.
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