XL98: Days of the Week Before March 1, 1900, Are Incorrect |
In Microsoft Excel 98 Macintosh Edition, when you use the WEEKDAY function
to compute the day of the week for dates prior to March 1, 1900, the
function returns an incorrect result.
For example, if you use the WEEKDAY function to determine the day of the
week for February 16, 1900, Microsoft Excel returns 5, which indicates that
February 16 was a Thursday. The function should return 6, because February
16, 1900, was actually a Friday.
When you use the WEEKDAY function to find the day of the week for dates on
or after March 1, 1900, the function returns the correct answer.
This problem occurs when the following conditions are true:
To work around this problem, add one to the result of the formula as in the following example:
=WEEKDAY("2/16/1900",1)+1
When the date system in Microsoft Excel was originally created, it was
designed to be fully compatible with date systems used by other
spreadsheet programs.
However, in this date system, the year 1900 is incorrectly interpreted as a
leap year. Because there is no February 29 ("leap day") in the year 1900,
the day of the week for any date before March 1, 1900 (the day after the
"leap day"), is not computed correctly.
Note that this only affects dates before March 1, 1900, and that the
error only occurs when using the 1900 Date System in Microsoft Excel.
This problem does not occur if you are using the 1904 date system. When you
use the 1904 date system and you use the WEEKDAY function to compute the
day of the week for dates prior to January 1, 1904, the function returns a
#VALUE! error.
Additional query words: year2000 y2k XL98 week day
Keywords : kbdta kb2000 xlformula
Version : MACINTOSH:98
Platform : MACINTOSH
Issue type : kbprb
Technology :
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Last Reviewed: August 5, 1999 © 2000 Microsoft Corporation. All rights reserved. Terms of Use. |