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Full Discussion: UNIX Date Formatting
Top Forums Shell Programming and Scripting UNIX Date Formatting Post 302910063 by Don Cragun on Tuesday 22nd of July 2014 08:03:59 AM
Old 07-22-2014
We think you didn't try anything because you didn't show us that you tried anything. If you show us what you have tried, we can often point out a very minor fix that will make your code work. Why not give us a starting point instead of making us start from scratch? Why not help us help you?

What you want is easy to do it for any given date format. It is not possible to extract DD from MM/DD/YYYY and DD/MM/YYYY or MMDDYYYY and DDMMYYYY and YYYYMMDD and YYYYDDMM since there is no way to determine whether 20122001 was intended to be January 20, 2012 or December 20, 2001 or whether 20140102 was intended to be January 2, 2014 or February 1, 2014.

As long as you have a shell that performs POSIX required parameter expansions, for the formats you specified you could use:
Code:
var="YYYY-MM-DD"
dd=${var##*-}
printf 'var=%s, dd=%s, using %s\n' "$var" "$dd" 'dd=${var##*-}'
var=DDMMYYYY
dd=${var%??????}
printf 'var=%s, dd=%s, using %s\n' "$var" "$dd" 'dd=${var%??????}'
var=DD/MM/YYYY
dd=${var%%/*}
printf 'var=%s, dd=%s, using %s\n' "$var" "$dd" 'dd=${var%%/*}'
var=YYYY/MM/DD
dd=${var##*/}
printf 'var=%s, dd=%s, using %s\n' "$var" "$dd" 'dd=${var##*/}'

which prints:
Code:
var=YYYY-MM-DD, dd=DD, using dd=${var##*-}
var=DDMMYYYY, dd=DD, using dd=${var%??????}
var=DD/MM/YYYY, dd=DD, using dd=${var%%/*}
var=YYYY/MM/DD, dd=DD, using dd=${var##*/}

These 2 Users Gave Thanks to Don Cragun For This Post:
drl rbatte1
 

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LEARN ABOUT CENTOS

dp

DP(8)								     [nmh-1.5]								     DP(8)

NAME

       dp - parse dates 822-style

SYNOPSIS

       /usr/lib/mh/dp [-form formatfile] [-format string] [-width columns] [-version] [-help] dates ...

DESCRIPTION

       Dp  is  a  program that parses dates according to the ARPA Internet standard.  It also understands many non-standard formats, such as those
       produced by TOPS-20 sites and some UNIX sites using ctime(3).  It is useful for seeing how nmh will interpret a date.

       The dp program treats each argument as a single date, and prints the date out in the official 822-format.  Hence, it  is  usually  best	to
       enclose each argument in quotes for the shell.

       To  override  the  output  format  used by dp, the -format string or -format file switches are used.  This permits individual fields of the
       address to be extracted with ease.  The string is simply a format string and the file is simply a format file.  See  mh-format(5)  for  the
       details.

       Here is the default format string used by dp:

	    %<(nodate{text})error: %{text}%|%(putstr(pretty{text}))%>

       which  says  that  if an error was detected, print the error, a `:', and the date in error.  Otherwise, output the 822-proper format of the
       date.

FILES

       $HOME/.mh_profile	  The user profile

PROFILE COMPONENTS

       None

SEE ALSO

       ap(8), Standard for the Format of ARPA Internet Text Messages (RFC-822)

DEFAULTS

       `-format' default as described above
       `-width' default to the width of the terminal

CONTEXT

       None

BUGS

       The argument to the -format switch must be interpreted as a single token by the shell that invokes dp.  Therefore, one must  usually  place
       the argument to this switch inside quotes.

MH.6.8								   11 June 2012 							     DP(8)
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