12-09-2005
Look for my datecalc script on this site. You will need it. Then you can do:
$ datecalc -j $(( $(datecalc -j 2005 12 12) - $(($(datecalc -d 2005 12 12)+7-6)) ))
2005 12 10
To explain that...
"datecalc -d 2005 12 12" returns a day-of-week number for the given date. It uses the same scheme as cron..0=sunday 6=saturday. To find out how may days ago the last saturday was we add 7 (days in a week) and subtract 6 (saturday is day 6 in this scheme.
"datecalc -j 2005 12 12" returns a modified julian day number for the given date. 2005-12-12 happens to be 53,716. Each date has a different mjd number. To find the date n days ago, we just subtract n from the mjd. Then we convert the newly computed mjd back to a date.
Be sure to read the "Date Arithmetic" article in our FAQ section. And my datecalc script has built-in help. Just do "datecalc -help".
And the preceding Sunday is always 6 days earlier then the Saturday. Once you have the Saturday you should be able to calculate the Sunday pretty easily.
10 More Discussions You Might Find Interesting
1. Shell Programming and Scripting
Hi,
I need to develop a script to check for the day. If the day is a Saturday then the script should check if the Saturday is the last Saturday of the month so that certain set of instruction can be executed is it is the last Saturday. I do not want to use the crontab as this needs to be part... (9 Replies)
Discussion started by: jobbyjoseph
9 Replies
2. Solaris
Hi ,
I have a date parameter passed in YYYYMMDD format , how can I check whether it is Sat or Sun on Solaris box , as we can do the same easily on linux box by using date -d YYYYMMDD '+a' .
Any pointres will be really helpful . (5 Replies)
Discussion started by: harpreetanand
5 Replies
3. Shell Programming and Scripting
Hi List,
I need write a script that looks for a file with name File_03-09_to_03-15_data.txt (File_LastSunday_to_LastSaturday_data.txt). If this file is not exists i have to look for a pervious weeks file like File_03-02_to_03-08_data.txt. This loop should continue untill it get a file or no file... (0 Replies)
Discussion started by: rejirajraghav
0 Replies
4. UNIX for Dummies Questions & Answers
How to find last sunday (date) using perl?
Eg, If i run today (26-Feb-2008 / Tuesday), I should get 24-Feb-2008 (Sunday).
Any help? (3 Replies)
Discussion started by: deepakwins
3 Replies
5. Shell Programming and Scripting
Hi,
I have a requirement to define all Saturdays/Sundays of every month in a year as holidays. I am making use of Date::Manip package available in perl.
I tried writing a recurrence as :
0:1*3:7:0:0:0 --> this relation helps me to define 3rd Sunday of a year as sunday.
My requirement is... (1 Reply)
Discussion started by: harpreetanand
1 Replies
6. Windows & DOS: Issues & Discussions
Hi am trying to get the upcoming Saturday date in the batch file.
Kindly help ASAP. its urgent.
:confused: (10 Replies)
Discussion started by: Zensar
10 Replies
7. Shell Programming and Scripting
Hi
Please help me with this problem
i need to find the date of last week sunday from the current given date (12 Replies)
Discussion started by: aishsimplesweet
12 Replies
8. Shell Programming and Scripting
Hi All,
I have a requirement in my project where a batch runs on any day of a week. The input files will land to the server every Sunday. I need to read these files based on the current BUS_DAY (which falls any day of the week).
For e.g : if the BUS_DAY is 20120308, we need to derive the... (3 Replies)
Discussion started by: dsfreddie
3 Replies
9. Shell Programming and Scripting
Hi,
Can anyone help in editing CRON (OR) write a script to run another script every second saturday??
I tried to make use of DATE command to find the day but couldnt proceed further.
your help is highly appreciated!
Thanks,
Mahi (11 Replies)
Discussion started by: mahi_mayu069
11 Replies
10. UNIX for Dummies Questions & Answers
Hi All,
Can you please let me know how to get the yesterday's date of the given date if the given date is Sunday?
I can't use GNU. I have the code to get the yesterday's date based on the system date.
Thanks (5 Replies)
Discussion started by: shash
5 Replies
LEARN ABOUT DEBIAN
calendar::simple
Calendar::Simple(3pm) User Contributed Perl Documentation Calendar::Simple(3pm)
NAME
Calendar::Simple - Perl extension to create simple calendars
SYNOPSIS
use Calendar::Simple;
my @curr = calendar; # get current month
my @this_sept = calendar(9); # get 9th month of current year
my @sept_2002 = calendar(9, 2002); # get 9th month of 2002
my @monday = calendar(9, 2002, 1); # get 9th month of 2002,
# weeks start on Monday
my @span = date_span(mon => 10, # returns span of dates
year => 2006,
begin => 15,
end => 28);
DESCRIPTION
A very simple module that exports one function called "calendar".
calendar
This function returns a data structure representing the dates in a month. The data structure returned is an array of array references. The
first level array represents the weeks in the month. The second level array contains the actual days. By default, each week starts on a
Sunday and the value in the array is the date of that day. Any days at the beginning of the first week or the end of the last week that are
from the previous or next month have the value "undef".
If the month or year parameters are omitted then the current month or year are assumed.
A third, optional parameter, start_day, allows you to set the day each week starts with, with the same values as localtime sets for wday
(namely, 0 for Sunday, 1 for Monday and so on).
date_span
This function returns a cur-down version of a month data structure which begins and ends on dates other than the first and last dates of
the month. Any weeks that fall completely outside of the date range are removed from the structure and any days within the remaining weeks
that fall outside of the date range are set to "undef".
As there are a number of parameters to this function, they are passed using a named parameter interface. The parameters are as follows:
year
The required year. Defaults to the current year if omitted.
mon The required month. Defaults to the current month if omitted.
begin
The first day of the required span. Defaults to the first if omitted.
end The last day of the required span. Defaults to the last day of the month if omitted.
start_day
Indicates the day of the week that each week starts with. This takes the same values as the optional third parameter to "calendar". The
default is 0 (for Sunday).
This function isn't exported by default, so in order to use it in your program you need to use the module like this:
use Calendar::Simple 'date_span';
EXAMPLE
A simple "cal" replacement would therefore look like this:
#!/usr/bin/perl -w
use strict;
use Calendar::Simple;
my @months = qw(January February March April May June July August
September October November December);
my $mon = shift || (localtime)[4] + 1;
my $yr = shift || (localtime)[5] + 1900;
my @month = calendar($mon, $yr);
print "
$months[$mon -1] $yr
";
print "Su Mo Tu We Th Fr Sa
";
foreach (@month) {
print map { $_ ? sprintf "%2d ", $_ : ' ' } @$_;
print "
";
}
A version of this example, called "pcal", is installed when you install this module.
Date Range
This module will make use of DateTime.pm if it is installed. By using DateTime.pm it can use any date that DateTime can represent. If
DateTime is not installed it uses Perl's built-in date handling and therefore can't deal with dates before 1970 and it will also have
problems with dates after 2038 on a 32-bit machine.
EXPORT
"calendar"
AUTHOR
Dave Cross <dave@mag-sol.com>
ACKNOWLEDGEMENTS
With thanks to Paul Mison <cpan@husk.org> for the start day patch.
COPYRIGHT
Copyright (C) 2002-2008, Magnum Solutions Ltd. All Rights Reserved.
LICENSE
This script is free software; you can redistribute it and/or modify it under the same terms as Perl itself.
SEE ALSO
perl, localtime, DateTime
perl v5.10.1 2010-04-02 Calendar::Simple(3pm)