=DATEDIF(1,B2-A2+B3-A3,"y")&"y "&DATEDIF(1,B2-A2+B3-A3,"ym")&"m
"&DATEDIF(1,B2-A2+B3-A3,"md")&"d"

Depending on how you define length you may have to add 1 to the date
difference (or to one of the dates)
Of course the formula can be shortened by using an intermediate cell for
B2-A2+B3-B2

--
Kind regards,

Niek Otten
Microsoft MVP - Excel

"mardoh" wrote in message
...
I need to calculate the difference between 2 dates and then total them.
Here's what I have so far:

From To Length of
Service
01/09/2003 31/01/2010 6y 4m 30d
01/06/2000 30/11/2002 2y 5m 29d
Total of Service: ??????????

I've used the following formula to calculate the total days worked:
=DATEDIF(A4,B4,"Y")&"y "&DATEDIF(A4,B4,"ym")&"m "&DATEDIF(A4,B4,"md")&"d"

Problem is I don't know how to add the two together to get the total
length
of service.

Thanks