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Convert Date Format

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# 1  
Old 11-27-2013
Convert Date Format
Hello,
I want to change the format of date value in variable.

e.g. cur_date = '2013/03/13 14:24:50' (yyyy/mm/dd hh24:mi:ss)

I want to change this to '13-MAR-2013 14:24:50

Following code coverts the current date to format I am looking for. But I do not know how this can be done for a date in different format that is stored in a variable.

Code:
date +'%d-%b-%Y %H:%M:%S' -d "$year$month$day $hour:$min:$sec"

# 2  
Old 11-27-2013
Quote:
Originally Posted by cartrider
Hello,
I want to change the format of date value in variable.

e.g. cur_date = '2013/03/13 14:24:50' (yyyy/mm/dd hh24:mi:ss)

I want to change this to '13-MAR-2013 14:24:50

Following code coverts the current date to format I am looking for. But I do not know how this can be done for a date in different format that is stored in a variable.

Code:
date +'%d-%b-%Y %H:%M:%S' -d "$year$month$day $hour:$min:$sec"

Try:
Code:
date +'%d-%b-%Y %H:%M:%S' -d "$curdate"

# 3  
Old 11-27-2013
Code:
$ cur_date='2013/03/13 14:24:50'
$ date -d "$cur_date" +'%d-%b-%Y %T'
13-Mar-2013 14:24:50

# 4  
Old 11-27-2013
I am not getting the expected output of 13-MAR-2013 14:24:50

Code:
elise->DEV> echo $curr_date
2013/03/13 14:24:50
elise->DEV> date +'%d-%b-%Y %H:%M:%S' -d "$curr_date"
27-Nov-2013 16:17:27
elise->DEV> date -d "$curr_date" +'%d-%b-%Y %T'clear
date: illegal option -- d
usage:  date [-u] mmddHHMM[[cc]yy][.SS]
        date [-u] [+format]
        date -a [-]sss[.fff]
elise->DEV>

# 5  
Old 11-27-2013
You need GNU date to use the -d option of date.

If you system doesn't have that available you may need to use a perl program like this:

Code:
#! /usr/bin/env perl
use Time::Local;
use POSIX qw(strftime);

my ($yyyy, $mm, $dd, $hh, $min, $ss) = split(/[:\/ ]/, $ARGV[0]);
print strftime("%d-%b-%Y %T\n", localtime(timelocal($ss,$min,$hh,$dd,$mm-1,$yyyy)));

Save as format_date.pl and run it like this:

Code:
$ cur_date='2013/03/13 14:24:50'
$ ./format_date.pl "$cur_date"
13-Mar-2013 14:24:50

# 6  
Old 11-27-2013
With a recent (1993 or later) Korn shell or bash, you could also use:
Code:
#!/bin/ksh
cur_date="${1:-2013/03/13 13:24:50}"
printf "Processing date: %s\n" "$cur_date"
amn="JANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDEC"
y=${cur_date%%/*}
m=${cur_date:5:2}
dm=${m#0}
d=${cur_date:8:2}
t=${cur_date#* }
printf "%s-%s-%s %s\n" "$d" "${amn:$(((dm-1)*3)):3}" "$y" "$t"

If you name this script tester and invoke it without arguments, you'll get:
Code:
Processing date: 2013/03/13 13:24:50
13-MAR-2013 13:24:50

If you invoke it with an operand, for example:
Code:
tester "2013/09/22 12:34:56"

you'll get:
Code:
Processing date: 2013/09/22 12:34:56
22-SEP-2013 12:34:56

# 7  
Old 11-27-2013
You could also use an array for the months but initialiser code is different for ksh and bash, which should work on older versions that don't support the substring expansion stuff.

I still like the perl solution as it gives you flexibility to user other date % formatters.

Code:
#!/bin/ksh
cur_date="${1:-2013/03/13 13:24:50}"
printf "Processing date: %s\n" "$cur_date"
set -A amn JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC
IFS='/ '
set -- $cur_date
printf "%s-%s-%s %s\n" "$3" "${amn[10#$2-1]}" "$1" "$4"
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