Chronomancer Class required a special activation code that could only be used once. It is now rare, since you can't buy the product that had the code anymore.
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It is rare you can't get no more
To get the chronomancer armor or class, you have to buy the 2011 year calendar from the heromart shop online
You could've obtain Chronomancer Class from HeroMart for $20 + shipping. However, I believe it has gone permanent rare now. Sorry.
Thief Enhancement
You get Paladin class in AQWorlds from Artix in Swordhaven (he is found in the inn).