here is another way:
CONVERTING JULIAN DATES
Here's a little piece of post-Y2K calendar trivia for you. Since the 1950s, astronomers and geophysicists have used Julian dates to track time in continuous, absolute terms, without bothersome seasons, leap years, or man-made conventions. Julian dates associate a date with the number of days elapsed since January 1 of the same year. (For example, Jan. 2, 2000, has the value of 2.)
Excel doesn't have a built-in option to convert dates to Julian time, but you can use this shortcut to convert today's date to the Julian format.
Just type this equation into any cell in your worksheet:
=VALUE(RIGHT(YEAR(TODAY()),2)&TEXT(TODAY()-DATE(YEAR(TODAY())-1,12,31),"000"

)
Now, you'll need to format this value to display five digits.
1.Right-click the cell that contains the value and
select Format Cells.
2.On the Number tab, choose Custom from the Category list
box.
3.In the Type text box, enter 00000.
4.Click OK.
ref from
Tejanorey
"Do not attack the First Marine Division. Leave the yellowlegs alone. Strike the American Army."
- Orders given to Communist troops in the Korean War; shortly afterward, the Marines were ordered to not wear their khaki leggings to keep the enemy from immediately fleeing