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Microsoft Excel (using the default 1900 Date System) cannot display dates before the year 1900, although this is not due to a two-digit integer being used to represent the year: Excel uses a floating-point number to store dates and times. The number 1.0 represents the first second of January 1, 1900, in the 1900 Date System (or January 2, 1904 ...
The leap year problem (also known as the leap year bug or the leap day bug) is a problem for both digital (computer-related) and non-digital documentation and data storage situations which results from errors in the calculation of which years are leap years, or from manipulating dates without regard to the difference between leap years and common years.
Excel includes February 29, 1900, incorrectly treating 1900 as a leap year, even though e.g. 2100 is correctly treated as a non-leap year. [ 91 ] [ 92 ] Thus, a formula counting dates between (for example) February 1, 1900 and March 1, 1900 will return an incorrect result.
Normally, a year is a leap year if it is evenly divisible by four. A year divisible by 100 is not a leap year in the Gregorian calendar unless it is also divisible by 400. For example, 1600 was a leap year, but 1700, 1800 and 1900 were not. Some programs may have relied on the oversimplified rule that "a year divisible by four is a leap year".
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While working on them, Wulf was constantly irritated by the way minor changes to the spreadsheet layout would cause the formulas to stop working. While considering this, Wulf hit upon the idea of "blocks", which would isolate inputs into separate named sections and the formulas could be applied to the names, not the cell references.
The National Center for Educational Statistics has released the "Nation's Report Card," which shows that American children are sliding in their reading skills and barely improving in mathematics.
These formulas are based on the observation that the day of the week progresses in a predictable manner based upon each subpart of that date. Each term within the formula is used to calculate the offset needed to obtain the correct day of the week. For the Gregorian calendar, the various parts of this formula can therefore be understood as follows: