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- The year 1900 problem concerns the misinterpretation of years recorded by only their last two digits, and whether they occurred before or after the year 1900. Unlike the year 2000 problem, it is not tied to computer software alone, since the problem existed before electronic computers did and has also cropped up in manual systems. The most common issue raised by the year 1900 problem regards people's ages. Often, a person's birth year was registered with only two digits, on the assumption that either it was not important exactly how old a person is, or that no one lives longer than one hundred years. In several countries, especially in Europe, a national identification number was introduced (often in the 1950s), including two-digit information about the birth year. The largest unwelcome side effect from this is people 100 or more years old being mistaken for young children or in some cases, young children being mistaken for adults. When handling the year 2000 problem, measures were sometimes taken to avoid or rectify this: modifying the national identification number, for instance. For example, year is recorded only with two digits in Bulgarian Uniform civil number; however, a solution was ready as early as the inception of the system in 1975: 20 was added to the month number for an individual born before 1900 and 40 for those born in or after 2000. (en)
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- The year 1900 problem concerns the misinterpretation of years recorded by only their last two digits, and whether they occurred before or after the year 1900. Unlike the year 2000 problem, it is not tied to computer software alone, since the problem existed before electronic computers did and has also cropped up in manual systems. The largest unwelcome side effect from this is people 100 or more years old being mistaken for young children or in some cases, young children being mistaken for adults. (en)
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