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Full Discussion: How to convert 24 hour time to 12 hour timing?
Top Forums Shell Programming and Scripting How to convert 24 hour time to 12 hour timing? Post 302762699 by Don Cragun on Tuesday 29th of January 2013 02:06:53 AM
Old 01-29-2013
Quote:
Originally Posted by Jotne
Code:
awk 'split($2,t,":") {if (t[1]>12) {print $1,t[1]-12":"t[2]":"t[3]" PM",$3,$4} else {print $1,t[1]+0":"t[2]":"t[3]" AM",$3,$4}}' file
13-Nov-2011 1:27:36 PM 15.32044 72.68502
13-Nov-2011 12:08:31 AM 15.31291 72.69807
16-Nov-2011 1:16:54 AM 15.30844 72.74028
15-Nov-2011 8:09:25 PM 15.35096 72.69842
16-Nov-2011 4:02:32 AM 15.30826 72.65642
27-Nov-2011 1:08:25 PM 15.48236 73.61669
13-Nov-2011 4:35:04 PM 15.31626 72.68628
13-Nov-2011 3:17:47 PM 15.31361 72.69728

Hi Jotne:
Although a timestamp between midnight and 1am doesn't appear in the sample input, I assumed that any 24 hour input time was possible.

Your script will print 0:mm:ss AM rather than 12:mm:ss AM for such cases. And your script prints 12:mm:ss AM rather than 12:mm:ss PM for times between noon and 1pm.
 

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LEARN ABOUT DEBIAN

apr::date

libapache2-mod-perl2-2.0.7::docs::api::APR::Date(3pm)	User Contributed Perl Documentation  libapache2-mod-perl2-2.0.7::docs::api::APR::Date(3pm)

NAME

       APR::Date - Perl API for APR date manipulating functions

Synopsis
	 use APR::Date ();

	 # parse HTTP-complient date string
	 $date_string = 'Sun, 06 Nov 1994 08:49:37 GMT';
	 $date_parsed = APR::Date::parse_http($date_string);

	 # parse RFC822-complient date string
	 $date_string = 'Sun, 6 Nov 94 8:49:37 GMT';
	 $date_parsed = APR::Date::parse_rfc($date_string);

Description
       "APR::Socket" provides the Perl interface to APR date manipulating functions.

API

       "APR::Date" provides the following functions and/or methods:

   "parse_http"
       Parse HTTP date strings

	 $date_parsed = parse_http($date_string);

       arg1: $date_string ( string )
	   The date string can be in one of the following formats:

	     Sun, 06 Nov 1994 08:49:37 GMT  ; RFC 822, updated by RFC 1123
	     Sunday, 06-Nov-94 08:49:37 GMT ; RFC 850, obsoleted by RFC 1036
	     Sun Nov  6 08:49:37 1994	    ; ANSI C's asctime() format

	   refer to RFC2616 for the details (GMT is assumed, regardless of the used timezone).

       ret: $date_parsed ( number )
	   the number of microseconds since 1 Jan 1970 GMT, or 0 if out of range or if the date is invalid.

       since: 2.0.00

       Remember to divide the return value by 1_000_000 if you need it in seconds.

   "parse_rfc"
       Parse a string resembling an RFC 822 date.  It's meant to be lenient in its parsing of dates.  Hence, this will parse a wider range of
       dates than "parse_http()".

	 $date_parsed = parse_rfc($date_string);

       arg1: $date_string ( string )
	   The date string can be in one of the following formats:

	     Sun, 06 Nov 1994 08:49:37 GMT  ; RFC 822, updated by RFC 1123
	     Sunday, 06-Nov-94 08:49:37 GMT ; RFC 850, obsoleted by RFC 1036
	     Sun Nov  6 08:49:37 1994	    ; ANSI C's asctime() format
	     Sun, 6 Nov 1994 08:49:37 GMT   ; RFC 822, updated by RFC 1123
	     Sun, 06 Nov 94 08:49:37 GMT    ; RFC 822
	     Sun, 6 Nov 94 08:49:37 GMT     ; RFC 822
	     Sun, 06 Nov 94 08:49 GMT	    ; Unknown [drtr@ast.cam.ac.uk]
	     Sun, 6 Nov 94 08:49 GMT	    ; Unknown [drtr@ast.cam.ac.uk]
	     Sun, 06 Nov 94 8:49:37 GMT     ; Unknown [Elm 70.85]
	     Sun, 6 Nov 94 8:49:37 GMT	    ; Unknown [Elm 70.85]

       ret: $date_parsed ( number )
	   the number of microseconds since 1 Jan 1970 GMT, or 0 if out of range or if the date is invalid.

       since: 2.0.00

       Remember to divide the return value by 1_000_000 if you need it in seconds.

See Also
       mod_perl 2.0 documentation.

Copyright
       mod_perl 2.0 and its core modules are copyrighted under The Apache Software License, Version 2.0.

Authors
       The mod_perl development team and numerous contributors.

perl v5.14.2							    2011-02-08		     libapache2-mod-perl2-2.0.7::docs::api::APR::Date(3pm)
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