topic Re: How to get a date after a specific number of days? in Operating System - HP-UX

How to get a date after a specific number of days?

Vidhya B — Thu, 17 Feb 2011 07:43:28 GMT

Hi all,

My date is in the format mmddyy. I need to know the date after say 25 days. Is there any specific command which can accompolish this?

Thanks in Advance!!

Re: How to get a date after a specific number of days?

nijokj — Fri, 02 Sep 2011 19:46:34 GMT

Please find the below thread in that there is a script from A. Clay Stephenson.kindly check whether it help you or not?
http://h30499.www3.hp.com/t5/System-Administration/favourite-sysadmin-scripts-you-always-keep-around/m-p/4844855#M393717

Re: How to get a date after a specific number of days?

Jorge Pons — Thu, 17 Feb 2011 08:49:23 GMT

Hi

could be with crontab?

Regards, Jorge

Re: How to get a date after a specific number of days?

Vidhya B — Thu, 17 Feb 2011 09:10:59 GMT

Hi,

Thank you all for your replies.

Is there any other specific command to do that?

Re: How to get a date after a specific number of days?

Duncan Edmonstone — Thu, 17 Feb 2011 09:55:28 GMT

If you have the GNU coreutils installed, you can use the GNU date command, which has a pile of date arithmetic capabilities. You can get GNU coreutils here:

http://hpux.connect.org.uk/hppd/hpux/Gnu/coreutils-8.6/

Don't miss the run-time dependencies required as well.

With GNU date installed you can run:

date --d "+25 days" +%m%d%y

You'll need to put the path to the GNU date command in front of that, otherwise it will just invoke the HP-UX date command.

No doubt the perl-mongers on the forums will also be able to give you a perl one-liner for this as well.

HTH

DUncan

Re: How to get a date after a specific number of days?

satheeshnp — Thu, 17 Feb 2011 10:37:04 GMT

Hi,

This might help you. Try this.

Result=$(perl -MPOSIX -le 'print strftime "%d%b",localtime(time+(60*60*24*25))')

Re: How to get a date after a specific number of days?

James R. Ferguson — Thu, 17 Feb 2011 13:10:16 GMT

Hi:

You might note that by using Perl and the 'strftime' function you can choose any date format you want. The format directives are equivalent to those you are familiar with in the 'date' command. Of course, see too the manpages for 'strftime(3C)'. For example:

# perl -MPOSIX -le 'print strftime "%d %b",localtime(time+(60*60*24*25))'
14 Mar

# perl -MPOSIX -le 'print strftime "%m/%d/%Y",localtime(time+(60*60*24*25))'
03/14/2011

# perl -MPOSIX -le 'print strftime "%m/%d/%Y %H:%M",localtime(time+(60*60*24*25))'
03/14/2011 09:08

Regards!

...JRF...

Re: How to get a date after a specific number of days?

Vidhya B — Fri, 18 Feb 2011 05:50:27 GMT

Hi,

That perl scripting really worked. Thanks a lot:)

But I am able to find the date after 25 days from today's date. Is there anyother modification I can do so that the perl will take my input?

Actually I need to find the date after 25 days from a specific date but not from today's date.Kindly help.

Re: How to get a date after a specific number of days?

James R. Ferguson — Fri, 18 Feb 2011 14:36:07 GMT

Hi:

> Actually I need to find the date after 25 days from a specific date but not from today's date.

You can begin with something like this an embellish as you like. Notice that I require the input as YYYYMMDD.

# cat ./fromwhen
#!/usr/bin/perl
use strict;
use warnings;
use POSIX qw(strftime);
use Time::Local;
my $date = shift or die "Date (YYYYMMDD) expected\n";
die "YYYMMDD expected\n" unless
my ( $yyyy, $mm, $dd ) = ( $date =~ /(\d{4})(\d\d)(\d\d)/ );
my $when = shift or die "Number of days in future expected\n";
my $secs = timelocal(0, 0, 0, $dd, $mm-1,$yyyy );
print strftime "%Y/%m/%d\n",localtime($secs+(60*60*24*$when));
1;

...run as (for example):

# .l/fromwhen 20110218 13
2011/03/03

...which yields the date thirteen (13) days from February 18, 2011.

Regards!

...JRF...

Re: How to get a date after a specific number of days?

Vidhya B — Fri, 18 Mar 2011 12:57:44 GMT

Hi,

Thankyou for the replies.

I tried the script. I don't how exactly to run that script. I found no good results. I think I have done some mistake. Please help me with this.

Re: How to get a date after a specific number of days?

James R. Ferguson — Fri, 18 Mar 2011 13:18:15 GMT

Hi:

> I tried the script. I don't how exactly to run that script. I found no good results. I think I have done some mistake.

Copy&paste the script I posted into a file named as you wish. Set execute permissions and then run it passing two arguments --- the first is the YYYYMMDD from which you want to count. The second argument is the number of days from the first argument date that you want to compute.

For example, I called the script 'fromwhen'. Hence:

# cd <script directory>
# chmod 555 ./fromwhen
# ./fromwhen 20110318 25
2011/04/12

...which shows that April 12 is 25-days from March 18.

Regards!

...JRF...

Re: How to get a date after a specific number of days?

Hein van den Heuvel — Fri, 18 Mar 2011 13:18:58 GMT

>> I tried the script. I don't how exactly to run that script. I found no good results. I think I have done some mistake. Please help me with this.

Hmmm. It works for me.
It came with usage example and has 'help' build in.

copy & paste into a (text) file.
In the example: "fromwhen"

Make executable
chmod +x fromwhen

Run it with 2 arguments... a date and days
Example:
./fromwhen 20080101 32
2008/02/02

Maybe your perl is not in the standard place?
Try 'which perl'

Anyway...

>> I found no good results.

So what did you get? Error message? Unexpected values? Show and tell!
We can not read your mind, nor your screen.

Cheers,
Hein.

Re: How to get a date after a specific number of days?

James R. Ferguson — Fri, 18 Mar 2011 13:26:21 GMT

Hi (again):

If your Perl isn't in '/usr/bin' simply change the 'shebang' line at the top of the script to point to the correct location.

Most commonly, you declare '#!/usr/bin/perl' in your scripts and simply symlink the Perl binary accordingly. This allows your scripts to make a static declaration while your binaries are installed in various subdirectories of '/opt' or '/usr' as your needs dictate.

Doing a 'whereis perl' is one way to find where 'perl' is. Another option is to use this for the 'shebang' (interpreter line):

#!/usr/bin/env perl

If you do this, the Perl interpreter will be "automatically" located for you.

As always, a problem description of "it doesn't work" doesn't provide any useful information. Be specific. Exactly what did you do and exactly what were the results you obtained. A good problem description leads to a good resolution.

Regards!

...JRF...

Re: How to get a date after a specific number of days?

Vidhya B — Fri, 18 Mar 2011 14:19:58 GMT

Hi,

I tried running the script in the way you mentioned.

Here is my error message:

#./fromwhen 20110318 02
./fromwhen[3]: use: not found.
./fromwhen[4]: use: not found.
./fromwhen[5]: Syntax error at line 5 : `(' is not expected.

Here is my whereis perl output :

#whereis perl
perl: /usr/bin/perl /opt/dsau/bin/perl /opt/dsau/sbin/perl /opt/perl/bin/perl /opt/perl_32/bin/perl /opt/perl_64/bin/perl /opt/VRTSperl/bin/perl /usr/eccperl/bin/perl /opt/perl/man/man1/perl.1 /opt/perl_32/man/man1/perl.1 /opt/perl_64/man/man1/perl.1 /opt/VRTSperl/man/man1/perl.1

Kindly help me with this.

Re: How to get a date after a specific number of days?

Patrick Wallek — Fri, 18 Mar 2011 14:22:49 GMT

Do you have the first line of the script as:

#!/usr/bin/perl

If not, make that the first line and then try again.

Re: How to get a date after a specific number of days?

Hein van den Heuvel — Fri, 18 Mar 2011 14:26:11 GMT

Ah, looks like you have the line "# cat ./fromwhen" as the first line in the script.
Remove that.
That was there just for clarification, not for inclusion.

Hein

Re: How to get a date after a specific number of days?

James R. Ferguson — Fri, 18 Mar 2011 15:53:01 GMT

Hi (again):

If you don't have an interpreter ("shebang") line in a file, then the shell is assumed.

Hence, if you don't have:

#!/usr/bin/perl

...as the first line of the script, then:

# /usr/bin/sh

...is assumed, and that leads to errors as the shell interpreter attempts to parse Perl syntax!

_Always_ begin your scripts with the interpreter declaration!

Regards!

...JRF...