A feature suggestion for a datetime trigger on a timer would not mean it would necessarily be any more accurate than hixxy's suggestion. In fact, I bet the implementation would be the C equivalent of that code. Either bug report it as mentioned or follow the scriptable suggestion below:

If synchronization is an issue, run a shorter timer that verifies the current date has been reached at which point you can set the timed timer, or do something similar once you're within N minutes of the intended trigger time.

Code:
alias cron.delay { return 30 }
alias cron {
  if ($calc($1 - $ctime - $3) < 300) { 
    .timer 1 $v1 $4-
  }
  else {
    var %delta = $calc($ctime - ($2 + $cron.delay))
    .timerCRON 1 $cron.delay cron $1 $ctime $calc($3 + %delta) $4-
  }
}
alias cronstart { cron $1 $ctime $cron.delay $2- }

/cronstart $ctime(1/1/2009 0:00) msg #somechan happy new year


The code above uses a delta accumulator to keep track of how far off the timer has wandered and adds this adjustment value to the final timer. This may not even be needed.

- argv[0] on EFnet #mIRC
- "Life is a pointer to an integer without a cast"