If you don't have GNU date, then another alternative is perl if you have that. From your input date, we need to split it up the values and feed them in:-
Code:
#!/bin/ksh
input_date=$1
in_yyyy="${input_date%????}" # Remove last four characters
in_dd="${input_date#??????}" # Remove lead four characters
in_mm="${input_date#????}" # Remove lead four characters
in_mm="${in_mm%??}" # Remove last two characters from previously split value
((temp_mm=$in_mm-1)) # Reduce month by one as epoch counts from 1/1/1970 as zero
# Get time in seconds since epoch
perl -e "use Time::Local; print timelocal(0,0,0,$in_dd,$temp_mm,$in_yyyy), ;" | read in_seconds
# Go back one day in seconds
((out_seconds=$in_seconds-86400))
# Display answer in required format
perl -e 'use POSIX qw(strftime);print scalar(strftime "%Y%m%d", localtime $ARGV[0]), "\n";' $out_seconds
I hope that this meets the brief you have given us. There may be smarter ways to read & split the input date, so I'm open to suggestions.
Obviously some validity checking on the input would be wise else you will get various horrible messages from the perl
I've put it in a script called 254222 (thread number) and tested it as shown:-
Hi,
I would like to find out how can i calculate a date which is 3 months ago. I intend to run a cron job on the 1st of every month, and calculate the month 4 months earlier from the date. For example, if today's date is 1st May 2007, i would like to return 012007( January 2007).
i can get... (1 Reply)
I want to calculate the date of next satureday of current date using shell script.
Suppose, today is 27-feb-08
I want to get the date of next satureday, which means 01-mar-08, in the formate '' YYMMDD ".
I do this in ksh..
Please tell me any type of command which help me out.
Thanks in... (3 Replies)
Hi guys,
I had a scenario...
1. I had to get the previous days date in yyyymmdd format
2. i had to create a file with Date inthe format yyyymmdd.txt format
both are different
thanks guys in advance.. (4 Replies)
Hello
I would like to help me create a script that:
Given a date, more precisely a year, one month and one day. must calculate the day after
-Input: Year, Month, Day
-Output: Next day the Year-Month-Day
thanks (9 Replies)
I am unable to get this KSH script to work. Can someone help. I've been told this should work with KSH93. Which I think I have on Solaris 10.
If I do a grep -i version /usr/dt/bin/dtksh I get
@(#)Version M-12/28/93d
@(#)Version 12/28/93
@(#)Version M-12/28/93
This is correct for... (5 Replies)
I need to get the next day's date of the user entered date
for example:
Enter date (yyyy/mm/yy):
2013/10/08I need to get the next day's date of the user entered date
Desired Output:
2013/10/09Though there are ways to achieve this is Linux or Unix environment (date command) ,I need to... (1 Reply)
How to get Julian date (Three digit) of a given date (Not current date)? I do not have root privilege - so can not use date -d. Assume that we have three variables year, month and date.
Thx (5 Replies)
I Have text like
XXX_20190908.csv.gz need to replace Only date in this format with current date every day
Thanks! (1 Reply)
Discussion started by: yamasani1991
1 Replies
LEARN ABOUT PHP
date_default_timezone_set
DATE_DEFAULT_TIMEZONE_SET(3) 1 DATE_DEFAULT_TIMEZONE_SET(3)date_default_timezone_set - Sets the default timezone used by all date/time functions in a script
SYNOPSIS
bool date_default_timezone_set (string $timezone_identifier)
DESCRIPTION date_default_timezone_set(3) sets the default timezone used by all date/time functions.
Note
Since PHP 5.1.0 (when the date/time functions were rewritten), every call to a date/time function will generate a E_NOTICE if the
timezone isn't valid, and/or a E_WARNING message if using the system settings or the $TZ environment variable.
Instead of using this function to set the default timezone in your script, you can also use the INI setting date.timezone to set the
default timezone.
PARAMETERS
o $timezone_identifier
- The timezone identifier, like UTC or Europe/Lisbon. The list of valid identifiers is available in the "List of Supported Time-
zones".
RETURN VALUES
This function returns FALSE if the $timezone_identifier isn't valid, or TRUE otherwise.
EXAMPLES
Example #1
Getting the default timezone
<?php
date_default_timezone_set('America/Los_Angeles');
$script_tz = date_default_timezone_get();
if (strcmp($script_tz, ini_get('date.timezone'))){
echo 'Script timezone differs from ini-set timezone.';
} else {
echo 'Script timezone and ini-set timezone match.';
}
?>
CHANGELOG
+--------+---------------------------------------------------+
|Version | |
| | |
| | Description |
| | |
+--------+---------------------------------------------------+
| 5.3.0 | |
| | |
| | Now throws E_WARNING rather than E_STRICT. |
| | |
| 5.1.2 | |
| | |
| | The function started to validate the $time- |
| | zone_identifier parameter. |
| | |
+--------+---------------------------------------------------+
SEE ALSO date_default_timezone_get(3), "List of Supported Timezones".
PHP Documentation Group DATE_DEFAULT_TIMEZONE_SET(3)
01-02-2015
