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Julian Date

Posted on 1997-12-18
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Last Modified: 2007-11-15
I need a function() that can be used in an update query that  will convert an regular date that is stored in one field, to a Julian date to be stored in another field.

Thank you in advance.
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Question by:jrd
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LVL 5

Accepted Solution

by:
cekman earned 400 total points
ID: 1963014
This came from MS KB article: Q162745

Hope it helps

The userdefined function CDate2Julian(), converts a date to a Julian day:
 
1. Create a module and type the following line in the Declarations section if it is not already there:
 
      Option Explicit
 
2. Type the following procedure:
 
    ' *********************************************************************
    ' FUNCTION: CDate2Julian()
    '
    ' PURPOSE: Convert a date to a Julian day. The function works with
    '          dates based on the Gregorian (modern) calendar.
    '
    ' ARGUMENTS:
    '    MyDate: A valid Microsoft Access date.
    '
    ' RETURNS: A three digit Julian day as a string.
    ' *********************************************************************
    Function CDate2Julian(MyDate As Date) As String
        CDate2Julian = Format(MyDate - DateSerial(Year(MyDate) - 1, 12, _
        31), "000")
    End Function
 
3. To test this function, type the following line in the Debug window, and
   then press ENTER:
 
      ?CDate2Julian(#3/1/1996#)
 
   Note that Julian day 061 is returned.
 
4. To convert a valid Microsoft Access date to a Julian date in a format
   like 96061 type the following line in the Debug window, and then press
   ENTER:
 
      ?Year(#3/1/1996#) Mod 100 & CDate2Julian(#3/1/1996#)
 
   Note that 96061 is returned.
 
5. To convert a valid Microsoft Access date to a Julian date in a format like 96-061 type the following line in the Debug window, and then press
   ENTER:
 
      ?Year(#3/1/1996#) Mod 100 & "-" & CDate2Julian(#3/1/1996#)

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Author Comment

by:jrd
ID: 1963015
Try this...


Change:
 Function CDate2Julian(MyDate As Date) .....

To:
 Function CDate2Julian(MyDate As Variant)......
0

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