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Top Forums Shell Programming and Scripting Converting date DD MM YYYY to DD MON YYYY Post 302510831 by Adamm on Tuesday 5th of April 2011 05:44:10 AM
Old 04-05-2011
Converting date DD MM YYYY to DD MON YYYY

Hello,

I am writing a script that parses different logs and produces one. In the source files, the date is in DD MM YYYY HH24:MI:SS format. In the output, it should be in DD MON YYY HH24:MI:SS (ie 25 Jan 2010 16:10:10)
To extract the dates, I am using shell substrings, i.e.:

Code:
read line
 
year=${line:8:4}
month=${line:5:2}
day=${line:2:2}
hour=${line:13:2}
min=${line:16:2}
sec=${line:19:2}
 
echo "$year$month$day$hour$min$sec" # prints something like 20110325161610 (I use this numeric value to compare it agains reference date, i.e. date when this script ran last time)
 
if [ "$year$month$day$hour$min$sec" -gt "$lastlog" ]
then
  # output date in DD MON FORMAT... how?
fi

Of course I can do a routine like: if mon = 01 then mon = 'JAN', if mon = 02 then mon = 'FEB'... But I guess there must be a nicer solution to this. Maybe solution that will take into account also LANG setting (not a requirement, but would like to have it).

Maybe date function can be used for that, but I did not figure out how to pass the -d parameter (what format should it be in?). Did not find much in FAQ: Date Arithmetics either Smilie
 

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grep-changelog(1)					      General Commands Manual						 grep-changelog(1)

NAME
grep-changelog - print ChangeLog entries matching criteria SYNOPSIS
grep-changelog [options] [CHANGELOG...] DESCRIPTION
grep-changelog searches the named CHANGELOGs (by default files matching the regular expressions ChangeLog and ChangeLog.[0-9]+) for entries matching the specified criteria. At least one option or file must be specified. This program is distributed with GNU Emacs. OPTIONS
The program accepts unambiguous abbreviations for option names. --author=AUTHOR Print entries whose author matches regular expression AUTHOR. --text=TEXT Print entries whose text matches regular expression TEXT. --exclude=TEXT Exclude entries matching regular expression TEXT. --from-date=YYYY-MM-DD Only consider entries made on or after the given date. ChangeLog date entries not in the "YYYY-MM-DD" format are never matched. --to-date=YYYY-MM-DD Only consider entries made on or before the given date. --rcs-log Print output in a format suitable for RCS log entries. This format removes author lines, leading spaces, and file names. --with-date In RCS log format, print short dates. --reverse Show matches in reverse order. --version Display version information. --help Display basic usage information. COPYING
Copyright (C) 2008, 2009 Free Software Foundation, Inc. Permission is granted to make and distribute verbatim copies of this document provided the copyright notice and this permission notice are preserved on all copies. Permission is granted to copy and distribute modified versions of this document under the conditions for verbatim copying, provided that the entire resulting derived work is distributed under the terms of a permission notice identical to this one. Permission is granted to copy and distribute translations of this document into another language, under the above conditions for modified versions, except that this permission notice may be stated in a translation approved by the Free Software Foundation. grep-changelog(1)
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