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Unable to add date to current date.

 
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Top Forums UNIX for Dummies Questions & Answers Unable to add date to current date.
# 1  
Old 03-04-2012
Question Unable to add date to current date.
Hi,

I am trying to display future date from the current date but unable to do so in UNIX (not in PERL). For eg: if today is March 5 then I want a variable wherein I can store Mar 7 date, but unable to get the future date from the current date.
I have tried many possible ways as mentioned below but all in vain. Kindly help me out as soon as possible

Code:
echo `date "+%b%e"  -d "+3 days"`
echo `date "+%b%e"  -d "+3 days in future"`
echo `date --date="-1 days" +%Y%m%d`

Last edited by methyl; 03-05-2012 at 01:16 PM.. Reason: please use code tags
# 2  
Old 03-04-2012
Try this mate,

Code:
echo THISISAVARIABLE=$(date -d "+3days" + %Y-%m-%d)

Last edited by methyl; 03-05-2012 at 01:19 PM.. Reason: code tags ; remove spaces from equals
# 3  
Old 03-04-2012
Hi Banned,
When I do so, see the error below:

------------------
Code:
$ echo `date -d "+3days" + %Y-%m-%d`
date: illegal option -- d
usage:  date [-u] mmddHHMM[[cc]yy][.SS]
        date [-u] [+format]
        date -a [-]sss[.fff]

------------------

---------- Post updated at 10:24 PM ---------- Previous update was at 08:18 PM ----------

Anyone, please can assist?
Last edited by methyl; 03-05-2012 at 01:18 PM.. Reason: code tags
# 4  
Old 03-04-2012
Looks like your installation of date doesn't support -d option.
1. Please mention your OS and shell.
2. Do you want it only in unix or is perl ok?

Code:
$ # Three days in future
$ perl -e '$x=localtime(time+(3*86400));print $x'
Thu Mar  8 03:53:00 2012
$ # Three days in past
$ perl -e '$x=localtime(time+(-3*86400));print $x'
Fri Mar  2 03:53:33 2012
$

# 5  
Old 03-05-2012
Code:
 
$ AFTER_TWO_DAYS=`TZ="GMT-48" date +'%m/%d/%Y'`
$ echo $AFTER_TWO_DAYS
03/07/2012

# 6  
Old 03-05-2012
Using Korn shell 93 (ksh93)
Code:
$ FUTURE=$(printf "%T"  "now + 3 days")
$ echo $FUTURE
Thu Mar 8 12:19:57 EST 2012

# 7  
Old 03-05-2012
@amit.mathur08
Please post what Operating System and version you have and what Shell you are using.
It would help to know what you are going to do with this future date field in case there is another approach.


@itkamaraj
Beware of the TZ method. On most O/S it does not work for values above 24 hours and it is only reliable 7/24 when the local timezone is GMT without Daylight Saving Time.
 
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