 # DateDiff Function

Monday Jul 28th 2008 by DatabaseJournal.com Staff

Determine the elapsed time between two dates stated in a specific interval.

>>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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