Re: Calculating time between 2 dates?

From: Thomas Kyte <tkyte_at_us.oracle.com>
Date: Mon, 26 Jul 1999 20:13:05 GMT
Message-ID: <37a4c135.29677183@newshost.us.oracle.com>

A copy of this was sent to TT-Boy <MarcBier_at_Rocketmail.com> (if that email address didn't require changing) On Mon, 26 Jul 1999 22:01:26 +0200, you wrote:

>How do I calculate the time between 2 dates?
>
>I am only interested in the time from the 2 date varables.
>
>end_time - start_time gives a strange answer
>
>Thanks,
>Marcus

you can get either TOTAL (days, hours, minutes, seconds) between 2 dates simply by subtracting them or with a little mod'ing you can get Days/Hours/Minutes/Seconds between.

To get the hours between 2 times, simply:

select ( date1 - date2 ) * 24 from T;

thats the number of hours (including the fractional component of an hour so you might get something like 3.1232253 meaning 3 hours and 1/12'th of an hour.

To break the diff between 2 dates into days, hours, minutes, sec -- you can use the following:

select to_char( created, 'dd-mon-yyyy hh24:mi:ss' ),

       trunc( sysdate-created ) "Dy",
       trunc( mod( (sysdate-created)*24, 24 ) )  "Hr",
       trunc( mod( (sysdate-created)*24*60, 60 ) )  "Mi",
 trunc( mod( to_char(sysdate,'SSSSS')-to_char(created,'SSSSS'), 60 ) ) "Sec",
       to_char( sysdate, 'dd-mon-yyyy hh24:mi:ss' ),
       sysdate-created "Tdy",
       (sysdate-created)*24 "Thr",
       (sysdate-created)*26*60 "Tmi",
       (sysdate-created)*26*60*60 "Tsec"

from all_users
where rownum < 50
/

Dy gives you number of days between 2 dates (partial days discarded). Tdy gives you total days including fractions (eg: you'll get 1.5 for 1 and 1/2 days)

Hr/Thr = hours
Mi/Tmi = minutes
Sec/Tsec = seconds...

--
See http://govt.us.oracle.com/~tkyte/ for my columns 'Digging-in to Oracle8i'... Current article is "Part I of V, Autonomous Transactions" updated June 21'st  

Thomas Kyte                   tkyte_at_us.oracle.com
Oracle Service Industries     Reston, VA   USA

Opinions are mine and do not necessarily reflect those of Oracle Corporation Received on Mon Jul 26 1999 - 15:13:05 CDT