To Date Time(double) method throws an Invalid Cast Expression, so standard conversion doesn’t work.
Therefore to handle this error, we simply assume an Excel value of 60 to correspond to 1/3/1900.
Note: Excel stores dates as sequential serial numbers so that they can be used in calculations.
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When I paste a large amount of data into Excel containing dates as far back as the 1800s, the recent dates display correctly as valid dates, but the older dates automatically convert to text. Excel handles dates occurring on or after 1/1/1900 perfectly (1/1/1904 in Excel for Mac as a default), but earlier dates are problematic.
I assume I need to adjust a setting in Excel, but I can't find it. You can easily see the problem simply by entering All editions of Excel have this problem in that they were never designed to handle dates earlier than 1/1/1900; Excel's date system simply numbers the days from 1/1/1900, with "1" representing Jan. This anomaly is officially blamed on Lotus spreadsheets. 29, 1900, as a valid date, even though that date did not occur (1900 was not a leap year because it is evenly divisible by 100 but not by 400).
To further compound calendar problems, different parts of the United States converted from the Julian calendar to the Gregorian calendar (which incorporates leap years) at different times using different approaches. Microsoft Excel does not attempt to account for any of these missing dates; instead Excel simply treats dates before 1900 as raw text rather than true dates, thereby avoiding these complicated date conversion issues.In the example below, cell A5 contains the date that we want to increase and decrease by 7 days (the value in C5). My future value calculations don't make any sense (see the spreadsheet below).As examples, Arizona, California, Florida, Nevada, New Mexico, and Texas followed Spain's conversion approach, and as a result, the dates Oct. 14, 1582, are not recognized as having occurred in those states. Oregon, Washington, and the Eastern Seaboard followed England's approach, and as a result, the dates Sept. The most frequently occurring problem caused by this issue relates to sorting date lists composed of dates both before and after Jan. To sort /1/1900 dates, you can reformat them using the yyyy/mm/dd custom format; for example, July 4, 1776, would appear as 17760704, and all dates formatted in this manner would sort properly.The Mississippi Valley area followed France's approach, and as a result, that locality does not recognize the dates Dec. However, if you need to actually perform calculations using these dates, you have a bigger problem that cannot be solved by changing the format.Note: Instructions for Microsoft Office in “Technology Q&A” refer to the 2013, 2010, and 2007 versions, unless otherwise specified.