It is a nice date, 12/12/12. It feels complete. Perfect. Not lacking in anything.
In the biblical sense, the number 12 is significant because it stands for:
12: months per year, tribes of Israel, apostles of Jesus; human completion
That is according to a Catholic resource site that I consulted.
There are 12 months in our calendar. We have all read about the 12 tribes of Israel. We were made to memorize the names of the 12 apostles of Jesus.
We always buy a dozen eggs, all twelve of them.
At this time of the year, we sing about The Twelve Days of Christmas. The famous song's real Catholic meaning is revealed in this article.
Another site is much more informative. It says:
Twelve implies maturity or totality. there were Twelve Apostles, corresponding to the Twelve Tribes of Israel; and the Book of Revelation is filled with imagery built around this number. The heavenly Jerusalem will be twelve thousand furlongs on all sides, having twelve jeweled foundations, with twelve gates of twelve pearls. There are twelve fruits of the Holy Spirit.I look forward to this day with faith, hope, and courage. It is a very special date. I am ready to be happily surprised.