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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