RE: date minus one

From: Anthony Molinaro <amolinaro_at_wgen.net>
Date: Tue, 29 Mar 2005 15:09:40 -0500
Message-ID: <D17DB304A9F42B4787B68861F9DAE61CD1023C@wgdc02.wgenhq.net>

Alternatively, if perl arouses nausea, you can use C (let's call this file sysdateMinus.c and the executable is sysdateMinus)

#include <stdio.h>
#include <stdlib.h>
#include <time.h>

=20

int main(int argc, char **argv)
{

    time_t t3, t1 =3D time(0);
    struct tm t2;
    int n =3D atoi(argv[1]);
    t2 =3D *localtime(&t1);
    t2.tm_mday -=3D n;
    t3 =3D mktime(&t2);
    printf("%s",ctime(&t3));
    return 0;
}

then you can pass the days to subtract to the command line:

$ ./sysdateMinus 0
Tue Mar 29 15:44:13 2005
$ ./sysdateMinus 1
Mon Mar 28 15:44:17 2005
$ ./sysdateMinus 10
Sat Mar 19 15:44:19 2005

Obviously you would add error checking other functionality=20 to make it more useful...

-----Original Message-----
From: oracle-l-bounce_at_freelists.org
[mailto:oracle-l-bounce_at_freelists.org] On Behalf Of Reidy, Ron Sent: Tuesday, March 29, 2005 2:30 PM
To: jknight_at_concordefs.com; oracle-l
Subject: RE: date minus one

perl -MDate::Calc -e '@yesterday =3D3D Date::Calc::Add_Delta_Days(1, 1, = 1,
=3D

(Date::Calc::Date_to_Days(Date::Calc::Today()) - 1) -1); print =3D @yesterday, "\n";'

prints:=3D20

20050328

Ron Reidy
Lead DBA
Array BioPharma, Inc.

-----Original Message-----
From: oracle-l-bounce_at_freelists.org
[mailto:oracle-l-bounce_at_freelists.org]On Behalf Of Knight, Jon Sent: Tuesday, March 29, 2005 11:55 AM
To: oracle-l
Subject: date minus one

Just curious how the rest of the world gets "yesterday" in UNIX. =3D We're
running Solaris and we execute a sqlplus script with "select sysdate-1 =
=3D

from
dual;" and pipe it to tail to set an environment variable.

Is there a more UNIXy way, -or- maybe a java function. Any =3D suggestions
welcome.

TIA,
Jon Knight

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Received on Tue Mar 29 2005 - 15:13:28 CST