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Microsoft Excel
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=== Date range === Excel supports dates with years in the range 1900β9999, except that December 31, 1899, can be entered as 0 and is displayed as 0-jan-1900. Converting a fraction of a day into hours, minutes and days by treating it as a moment on the day January 1, 1900, does not work for a negative fraction.<ref>{{cite web|url=http://support.microsoft.com/kb/182247|title=Negative date and time value are displayed as pound signs (###) in Excel|publisher=Microsoft|access-date=March 26, 2012|archive-date=February 26, 2015|archive-url=https://web.archive.org/web/20150226120445/http://support.microsoft.com/kb/182247|url-status=live}}</ref>
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