Almost everybody who works at a serious job knows the date they started working for a company. When that date comes around, they expect to have a review and hopefully a raise.
When that date comes around, and then a few weeks pass with no word, you start to wonder when and if you will be getting that review. On one hand you want to just wait it out to see how long they’ll forget and bring it up a while down the road and play the victim of poor management. On the other hand, you want to bring it up asap so that you don’t have to wait 6 months for a raise and lose out on the extra income!
The point is, a good manager will never let their employees have to wonder if and when they might be getting their review. It’s a morale killer to make employees wonder if they are valued enough for an on-time review. A business isn’t a business without it’s employees. Treat them right.