BEx Query to calculate Individual's experience

Hi Experts,

I want to generate a report whereby I want to calculate the experience of respective individual using BEx query designer. I have 4 InfoObjects with me namely:

EMP_NO,

JOIN_DATE (mapped to 0CALMONTH) during transformation,

END_DATE (mapped to 0CALDAY) during transformation and

EXPR (key figure IO) to hold the employee experience.

Can someone suggest me how can I calculate the experience of individuals based on the multiple JOIN_DATE's and END_DATE's that they are having? I have to consider first JOIN_DATE and last END_DATE and divide it by 365 to get the experience. In-case the employee left the organization his END_DATE is less than CURRENT DATE. On the other hand, for existing employees the END_DATE is by default 31.12.9999 which we have to convert to CURRENT DATE.

I will be grateful if somebody can suggest me the detailed steps to solve the above mentioned requirement.

Thanks,

Santoshpratim