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Full Discussion: Sort -t: -k1
Top Forums UNIX for Beginners Questions & Answers Sort -t: -k1 Post 303043832 by jim mcnamara on Friday 7th of February 2020 06:16:30 PM
Old 02-07-2020
To sort dates it works best to convert them to epoch seconds - the number of seconds since Jan 1 970. This code adds an epoch time sorts based on the epoch time, then prints the original minus the seconds: this assumes some kin of linux OS -
Code:
while read dt 
do   
   echo $(date -d "$dt" +%s) $dt;    
 done <  file | sort -k1n | awk '{printf("%s %s %s %s\n", $2, $3, $4, $5) }'

Called a tag sort.
I get this output:
Code:
Jan 20 16:27:38 2020
Jan 20 16:29:51 2020
Jan 20 16:44:39 2020
Jan 20 16:56:41 2020
Feb 03 15:58:27 2020
Feb 03 16:01:23 2020
Feb 03 16:11:29 2020
Feb 04 11:01:49 2020

--- Post updated at 17:16 ---

@Drl - one of our senior people, may mention getting a linux package for date operations, one of the commands is "dsort" which does exactly what the code above does. Hopefully he will mention where to download it. I do not know
These 2 Users Gave Thanks to jim mcnamara For This Post:
 

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CONVDATE(1)						    InterNetNews Documentation						       CONVDATE(1)

NAME
convdate - Convert to/from RFC 5322 dates and seconds since epoch SYNOPSIS
convdate [-dhl] [-c | -n | -s] [date ...] DESCRIPTION
convdate translates the date/time strings given on the command line, outputting the results one to a line. The input can either be a date in RFC 5322 format (accepting the variations on that format that innd(8) is willing to accept), or the number of seconds since epoch (if -c is given). The output is either ctime(3) results, the number of seconds since epoch, or a Usenet Date: header, depending on the options given. If date is not given, convdate outputs the current date. OPTIONS
-c Each argument is taken to be the number of seconds since epoch (a time_t) rather than a date. -d Output a valid Usenet Date: header instead of the results of ctime(3) for each date given on the command line. This is useful for testing the algorithm used to generate Date: headers for local posts. Normally, the date will be in UTC, but see the -l option. -h Print usage information and exit. -l Only makes sense in combination with -d. If given, Date: headers generated will use the local time zone instead of UTC. -n Rather than outputting the results of ctime(3) or a Date: header, output each date given as the number of seconds since epoch (a time_t). This option doesn't make sense in combination with -d. -s Pass each given date to the RFC 5322 date parser and print the results of ctime(3) (or a Date: header if -d is given). This is the default behavior. EXAMPLES
Most of these examples are taken, with modifications from the original man page dating from 1991 and were run in the EST/EDT time zone. % convdate '10 Feb 1991 10:00:00 -0500' Sun Feb 10 10:00:00 1991 % convdate '13 Dec 91 12:00 EST' '04 May 1990 0:0:0' Fri Dec 13 12:00:00 1991 Fri May 4 00:00:00 1990 % convdate -n '10 feb 1991 10:00' '4 May 90 12:00' 666198000 641880000 % convdate -c 666198000 Sun Feb 10 10:00:00 1991 ctime(3) results are in the local time zone. Compare to: % convdate -dc 666198000 Sun, 10 Feb 1991 15:00:00 +0000 (UTC) % env TZ=PST8PDT convdate -dlc 666198000 Sun, 10 Feb 1991 07:00:00 -0800 (PST) % env TZ=EST5EDT convdate -dlc 666198000 Sun, 10 Feb 1991 10:00:00 -0500 (EST) The system library functions generally use the environment variable TZ to determine (or at least override) the local time zone. HISTORY
Written by Rich $alz <rsalz@uunet.uu.net>, rewritten and updated by Russ Allbery <rra@stanford.edu> for the -d and -l flags. $Id: convdate.pod 8894 2010-01-17 13:04:04Z iulius $ SEE ALSO
active.times(5). INN 2.5.2 2010-02-08 CONVDATE(1)
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