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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 OSF1

dp

dp(8)							      System Manager's Manual							     dp(8)

NAME

       dp - parse dates RFC 822-style

SYNOPSIS

       /usr/lib/mh/dp [-form file] [-format string] [-help] [-width columns] dates

OPTIONS

       Overrides  the  default	output format of dp.  The output is formatted according to the instructions in the specified file.  This must be a
       format file; see mh-format(4).  Overrides the default output format of dp.  The output is formatted according to the  instructions  in  the
       specified string.  This must be a format string; see mh-format(4).

	      The argument to the -format option must be interpreted as a single token by the shell that invokes dp. Therefore, you should usually
	      place the argument to this option inside double quotes (").  Prints a list of the valid options  to  this  command.   Specifies  the
	      width of the screen in columns.

       The defaults for this command are as follows:

       -width defaults to the width of the terminal

DESCRIPTION

       The dp command 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 MH will interpret a date.

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

EXAMPLES

       This is the default format string used by dp:

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

       When an error is detected, this prints error: and the date that is in error. Otherwise, it outputs the proper RFC 822 format of the date.

FILES

       User profile.

SEE ALSO

       Commands: ap(8)

       Standard for the Format of ARPA Internet Text Messages (RFC 822)

																	     dp(8)
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