converting julian day and year to a date?

C

Chad Nordberg

I have a weather station that outputs a text file with two columns, one with
a 4 digit year, and another with the julian day. I need to convert the
julian day to a standard date format (i.e. 3/25/2006). I can use the "DAY"
function in excel to return the day from the julian day, but it only works if
February has 29 days. Does anyone have a calculation to convert the julian
day to the correct standard date format taking into consideration the year.
I have been using the following formula to do it, but it only works on or
after march 1st. I have to change it for 1/1 through 2/28 for the other 3
years.

=DATEVALUE(CONCATENATE((MONTH(B1+1)),"-",(DAY(B1+1)),"-",A1))

Where B1 is the julian day and A1 is the 4 digit year.

Thank you for your time and effort.

Sincerely,
Chad Nordberg
(e-mail address removed)
 

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