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Full Discussion: Date format change in a csv file
Top Forums Shell Programming and Scripting Date format change in a csv file Post 302948829 by Smiling Dragon on Thursday 2nd of July 2015 07:17:14 PM
Old 07-02-2015
I'm going to assume this is some sort of *nix environment due to the requirement for it to be in shell.
The date command can do this for you:
Code:
date -d "$yourolddateformat" +"%d/%b/%Y %H:%M:%S"

If you need to do this via shell (I'll use bourne as it's the only shell you have on all *nix's), you'll just need to do a little lookup:
Code:
month=`echo "$yourolddateformat" | cut -d '/' -f 1`
day=`echo "$yourolddateformat" | cut -d '/' -f 2`
therest=`echo "$yourolddateformat" | cut -d '/' -f 3`
case $month in
  01)
    monthname="Jan"
    ;;
  02)
    monthname="Feb"
    ;;
  03)
    monthname="Mar"
    ;;
  04)
    monthname="Apr"
    ;;
  05)
    monthname="May"
    ;;
  06)
    monthname="Jun"
    ;;
  07)
    monthname="Jul"
    ;;
  08)
    monthname="Aug"
    ;;
  09)
    monthname="Sep"
    ;;
  10)
    monthname="Oct"
    ;;
  11)
    monthname="Nov"
    ;;
  12)
    monthname="Dec"
    ;;
  *)
    exit 1
    ;;
esac
echo "${day}/${monthname}/$therest"

The date command is tested, the script is not - some debug may be required.
Some editing will be required to make it fit you larger needs of course too but the core should be enough to get you 95% there.
 

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LEARN ABOUT DEBIAN

data::formvalidator::constraints::dates

Data::FormValidator::Constraints::Dates(3pm)		User Contributed Perl Documentation	      Data::FormValidator::Constraints::Dates(3pm)

NAME

       Data::FormValidator::Constraints::Dates - Validate Dates and Times

SYNOPSIS

	   use Data::FormValidator::Constraints::Dates qw(date_and_time);

	   # In a DFV profile...
	   constraint_methods => {
	       # 'pp' denotes AM|PM for 12 hour representation
	       my_time_field => date_and_time('MM/DD/YYYY hh:mm:ss pp'),
	   }

DESCRIPTION

   date_and_time
       Note: This is a new module is a new addition to Data::FormValidator and is should be considered "Beta".

       This constraint creates a regular expression based on the format string passed in to validate your date against. It understands the
       following symbols:

	   Y   year  (numeric)
	   M   month (numeric)
	   D   day   (numeric)
	   h   hour
	   m   minute
	   s   second
	   p   AM|PM

       Other parts of the string become part of the regular expression, so you can do perlish things like this to create more complex expressions:

	   'MM?/DD?/YYYY|YYYY-MM?-DD?'

       Internally Date::Calc is used to test the functions.

BACKWARDS COMPATIBILITY

       This older, more awkward interface is supported:

	   # In a Data::FormValidator Profile:
	   validator_packages => [qw(Data::FormValidator::Constraints::Dates)],
	   constraints => {
	       date_and_time_field	 => {
		   constraint_method => 'date_and_time',
		   params=>['MM/DD/YYYY hh:mm:ss pp'], # 'pp' denotes AM|PM for 12 hour representation
	       },
	   }

SEE ALSO

       o   Data::FormValidator

       o   Data::FormValidator::Constraints::DateTime  - This alternative features returning dates as DateTime objects and validating against the
	   date formats required for the MySQL and PostgreSQL databases.

AUTHOR

       Mark Stosberg, <mark@summersault.com>

       Featuring clever code by Jan Krynicky.

COPYRIGHT AND LICENSE

       Copyright 2003-2005 by Mark Stosberg

       This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

perl v5.14.2							    2011-11-25			      Data::FormValidator::Constraints::Dates(3pm)
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