Use below ABAP function, you can calculate days.

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CALL FUNCTION 'FIMA_DAYS_AND_MONTHS_AND_YEARS'
  EXPORTING
    I_DATE_FROM = '19991008'
    I_DATE_TO   = '20000116' 
  IMPORTING
    E_DAYS      = T_DAYS 
    E_MONTHS    = T_MONTHS
    E_YEARS     = T_YEARS.
　
Result :  T_DAYS   = 466 
          T_MONTHS = 16  
          T_YEARS  = 2

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