Just for fun and not to be taken too seriously, here is a "Pseudo-Schwartzian" solution: 

use strict;
use warnings;

print    map { /^(.{19})(.*)$/; "$2$1\n" } sort map { /^(.*)(.{19})$/;
+ "$2$1" } <DATA>;

__DATA__
RRsnap02  2013-07-24 12:35:35
vmk000    2013-07-22 17:16:50
vmk001    2013-07-22 20:00:36
vmk009    2013-07-23 18:21:12
vmk010    2013-07-23 18:31:00
vmk020    2013-07-23 23:30:43
vmk024    2013-07-24 03:27:30
vmk031    2013-07-24 10:27:36
vmk032    2013-07-24 11:27:38
vmk032    2013-07-24 11:27:38

[download]

UPDATE: -- for me for not realizing that choroba had posted the same thing above already: Re: sort timestamps with associated names.

In reply to Re: sort timestamps with associated names. by hdb
in thread sort timestamps with associated names. by Sparky

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