DateDiff Function

>>Script Language and Platform: Oracle
Determine the elapsed time between two dates stated in a specific interval.

Author: Paul Hunter

create or replace function DateDiff(DatePart varchar, StartDate date, EndDate date)
/*
================================================================================
Developer:  Paul Hunter
Created  :  05/22/2007
Purpose  :  Returns the DatePart difference between the two dates provided.
Arguments:
    DatePart :  Specifies which part of the date to calculate the difference.
                The table below list DateParts and abbreviations recognized
                    1)    D, DD, Day;
                    2)    M, MM, Month;
                    3)    Y, YY, Year;
                    4)    H, HH, Hour;
                    5)    N, NN, Minute;
                    6)    S, SS, Second;
    StartDate:  The beginning date for the calculation
    EndDate  :  The ending date for the calculation
================================================================================
*/
return number
as
result    number;
sType    char(1);
begin
    sType := substr(upper(DatePart), 1, 1);
    if sType = ‘S’ then
        result := trunc(86400 * (EndDate – StartDate));
    end if;
    if sType = ‘H’ then
        result := trunc(((86400 * (EndDate – StartDate)) / 60) / 60);
    end if;
    if sType = ‘D’ then
        result := trunc((((86400 * (EndDate – StartDate)) / 60) / 60) / 24);
    end if;
    if sType = ‘W’ then
        result := trunc(((((86400 * (EndDate – StartDate)) / 60) / 60) / 24) / 7);
    end if;
    if sType = ‘Y’ then
        result := trunc(months_between(EndDate, StartDate) / 12);
    end if;
    if sType = ‘N’ then
        result := trunc((86400 * (EndDate – StartDate)) / 60);
    end if;
    if sType = ‘M’ then
        if upper(DatePart) like ‘MI%’ then
            result := trunc((86400 * (EndDate – StartDate)) / 60);
        else
            result := trunc(months_between(EndDate, StartDate));
        end if;
    end if;
return result;
exception when others then return null;
end;

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