#!/usr/bin/perl -w
use strict;
use Date::Tie;
use POSIX qw(strftime);

tie my %base, "Date::Tie";
my $loops;

{
    tie my %meet, "Date::Tie",
        year => $base{year}, month => $base{month}, day => 1;

    # Set the week to the week that has the third tuesday
    $meet{week} += $meet{weekday} <= 2 ? 2 : 3;
    # Set the day to tuesday
    $meet{weekday} = 2;

    # Use the next month if we already met (or met/meet today)
    $base{month}++, redo
        if $meet{yearday} <= $base{yearday} and not $loops++;

    print strftime "%d %B %Y\n", 0, 0, 0,
        $meet{day}, $meet{month}-1, $meet{year}-1900;
}

[download]

(...Rotterdam PM meetings...)
Update - Useful month shifting now (previous went from 19 Nov to 19 Dec, which is not even a tuesday) 

- Yes, I reinvent wheels.
- Spam: Visit eurotraQ.

In reply to The next third tuesday of the month by Juerd

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