SAP KD

In ABAP there is a function to calculate the number of days, months and years!

Example:

CALL FUNCTION 'FIMA_DAYS_AND_MONTHS_AND_YEARS'
  EXPORTING
    I_DATE_FROM = '20081008'

    I_DATE_TO   = '20090116'
  IMPORTING
    E_DAYS      = T_DAYS
    E_MONTHS    = T_MONTHS
    E_YEARS     = T_YEARS.
　
Result :  T_DAYS   = 466
          T_MONTHS = 16
          T_YEARS  = 2