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Full Discussion: Date Compare tool
Top Forums Shell Programming and Scripting Date Compare tool Post 303012959 by Don Cragun on Tuesday 13th of February 2018 02:39:06 AM
Old 02-13-2018
Kindly think about what you are asking. Then give us a few more details:
  1. What operating system are you using?
  2. What shell do you want to use to run your shell script?
  3. In what format will dates be entered?
  4. Where will the dates be found? (Are they provided as variables in your shell script? Are they command-line parameters? Are they typed in in response to prompts? Are they found in known files? ...)
  5. In what way do you want dates to be compared? (Are you just trying to determine if they specify the same date? Are you trying to determine the number of days between two dates? If your dates includes hours, minutes, and seconds; are you trying to determine the number of seconds between the two dates?)
Please help us help you.
This User Gave Thanks to Don Cragun For This Post:
barryallen
 

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LEARN ABOUT OPENSOLARIS

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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