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Full Discussion: Date format change from mm/dd/yyyy to yyyymmdd in comma seperate line in perl
Top Forums Programming Date format change from mm/dd/yyyy to yyyymmdd in comma seperate line in perl Post 302993180 by durden_tyler on Tuesday 7th of March 2017 12:10:08 PM
Old 03-07-2017
If it is known that any token that has the "/" character is always a date in "mm/dd/yyyy" format, then you could use this:

Code:
$
$ cat input_1.txt
,A,FDRM0002,12/21/2017,,0.961751583,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
$
$ perl -lne 's|(\d+)/(\d+)/(\d+)|$3$1$2|g; print' input_1.txt
,A,FDRM0002,20171221,,0.961751583,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
$
$

The code above will convert all such (supposedly date-like) occurrences on each line of the file. Here's another example:

Code:
$
$ cat input_2.txt
,A,FDRM0002,12/21/2017,,0.961751583,,3/31/2016,,,,,,,,,,,,,,,,,,,,,,,,10/3/2015,,,,,,,,,,,
$
$ perl -lne 's|(\d+)/(\d+)/(\d+)|$3$1$2|g; print' input_2.txt
,A,FDRM0002,20171221,,0.961751583,,2016331,,,,,,,,,,,,,,,,,,,,,,,,2015103,,,,,,,,,,,
$
$

If you want only the first occurrence to be changed, then remove the qualifier "g" at the end of the s/// operator.

On the other hand, if:
(a) it is known that the 4th token is the one that has the date in it, or
(b) only the 4th token is to be changed, the others are not (whether they are dates or not)
then you could do something like the following:

Code:
$
$ cat input_3.txt
,A,FDRM0002,12/21/2017,,0.961751583,,new text/image,,,,,,,,,,,,,,,,,,,,,,,,11/29/2016,,,,,,,,,,,
$
$ perl -F"," -lane '$F[3] =~ s|(\d+)/(\d+)/(\d+)|$3$1$2|; print join(",", @F)' input_3.txt
,A,FDRM0002,20171221,,0.961751583,,new text/image,,,,,,,,,,,,,,,,,,,,,,,,11/29/2016,,,,,,,,,,,
$
$

 

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LEARN ABOUT CENTOS

gensprep

gensprep(8)							 ICU 50.1.2 Manual						       gensprep(8)

NAME

       gensprep - compile StringPrep data from files filtered by filterRFC3454.pl

SYNOPSIS

       gensprep [ -h, -?, --help ] [ -v, --verbose ] [ -c, --copyright ] [ -s, --sourcedir source ] [ -d, --destdir destination ]

DESCRIPTION

       gensprep reads filtered RFC 3454 files and compiles their information into a binary form.  The resulting file, <name>.icu, can then be read
       directly by ICU, or used by pkgdata(8) for incorporation into a larger archive or library.

       The files read by gensprep are described in the FILES section.

OPTIONS

       -h, -?, --help
	      Print help about usage and exit.

       -v, --verbose
	      Display extra informative messages during execution.

       -c, --copyright
	      Include a copyright notice into the binary data.

       -s, --sourcedir source
	      Set the source directory to source.  The default source directory is specified by the environment variable ICU_DATA.

       -d, --destdir destination
	      Set the destination directory to destination.  The default destination directory is specified by the environment variable ICU_DATA.

ENVIRONMENT

       ICU_DATA  Specifies the directory containing ICU data. Defaults to /usr/share/icu/50.1.2/.  Some tools in ICU depend on the presence of the
		 trailing slash. It is thus important to make sure that it is present if ICU_DATA is set.

FILES

       The  following files are read by gensprep and are looked for in the source /misc for rfc3454_*.txt files and in source /unidata for Normal-
       izationCorrections.txt.

       rfc3453_A_1.txt	   Contains the list of unassigned codepoints in Unicode version 3.2.0....

       rfc3454_B_1.txt	   Contains the list of code points that are commonly mapped to nothing....

       rfc3454_B_2.txt	   Contains the list of mappings for casefolding of  code points when Normalization form NFKC is specified....

       rfc3454_C_X.txt	   Contains the list of code points that are prohibited for IDNA.

       NormalizationCorrections.txt
			   Contains the list of code points whose normalization has changed since Unicode Version 3.2.0.

VERSION

       50.1.2

COPYRIGHT

       Copyright (C) 2000-2002 IBM, Inc. and others.

SEE ALSO

       pkgdata(8)

ICU MANPAGE
							   18 March 2003						       gensprep(8)
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