User-Agent:       Mozilla/5.0 (X11; Linux x86_64; rv:5.0) Gecko/20100101 Firefox/5.0

Both the man page and the help from the vmstat command document the "-t" option, as one which adds timestamp to the output:

$ man vmstat
 ...
SYNOPSIS
       vmstat [-a] [-n] [-t] [delay [ count]]
 ...
       The -t switch adds timestamp to the output.

However as far as I can tell there is no way to get this to work.

I had a look at the source RPM and it looks like this is supposed to be enabled via the procps-3.2.7-vmstat-timestamp.patch file, however this does not modify the arguments to getopt(), so this would never work. This should be a simple, 1-character fix to vmstat.c in the main() function:

  while((c = getopt(argc, argv, "VdafmDnp:S:st")) != EOF) switch(c) {

I went ahead and tested this - it seems to work fine. I'll attached a replacement for the procps-3.2.7-vmstat-timestamp.patch with this minor change which could be used instead.

(I know I should stick to the issue in the bug report, but shouldn't these patches be pushed upstream, or maybe fork the project if it is quiescent?)

Reproducible: Always

Steps to Reproduce:
1. vmstat -t 1

Actual Results:  
/usr/bin/vmstat: invalid option -- 't'


Expected Results:  
procs -----------memory---------- ---swap-- -----io---- --system-- -----cpu------ ---timestamp---
 r  b   swpd   free   buff  cache   si   so    bi    bo   in   cs us sy id wa st
 1  0      0 2509064 346936 2664124    0    0    64    55  850  735  7  3 90  0  0	2011-07-19 11:35:01 CEST