Microsoft KB Archive/95078

= How to Work With Serial Dates and Julian Dates =

Article ID: 95078

Article Last Modified on 8/15/2005

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APPLIES TO


 * Microsoft Excel 97 Standard Edition
 * Microsoft Excel 95 Standard Edition
 * Microsoft Excel 5.0 Standard Edition
 * Microsoft Excel 98 for Macintosh

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This article was previously published under Q95078





SUMMARY
Many government agencies and contractors require the use of Julian dates (that is, the number of days from the first of the year and the number of days until the end of the year as printed on most desktop calendars).

In Microsoft Excel, the following formula converts a serial number date to a Julian date

=TEXT(Standard_Date,&quot;yy&quot;)&TEXT((Standard_Date-

DATEVALUE(&quot;1/1/&quot;&TEXT(Standard_Date,&quot;yy&quot;))+1),&quot;000&quot;)

where Standard_Date is the defined name given to the cell that contains the date to be converted. The entire formula must be entered in a single cell.

Note that the following formulas assume that your dates are within the range of January 1, 1900 to December 31, 1999.

The following formula converts a Julian date to a standard serial date in Microsoft Excel:

=DATE(1900+INT(Julian_Date/1000),1,MOD(Julian_Date,1000))

To calculate the number of days that have transpired since January 1 of the current year, use the following formula:

=INT(((NOW/365.255)-(YEAR(NOW)-1900))*365.255)

To calculate the number of days left in the current year, use the following formula:

=(DATE(1+YEAR(NOW),1,1)-(DATE(YEAR(NOW),1,1)))-

TRUNC(((NOW/365.255)-(YEAR(NOW)-1900))*365.255)

The following are examples of Julian dates:

  Normal date   Julian date -

Jan-01-1998  98001 Jan-10-1998  98010

Additional query words: 2.0 2.00 3.0 3.00 4.00 5.0 7.0 8.00 97 XL97 98 XL98 XL

Keywords: KB95078

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