Dim light at night

[sidjohn1]

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Dimming Slowly... every 5 minutes

Hi, I have a questions, I installed a few more dimmers last weekend and I want to do two things: 1- program one dimmer to very slowly dim a light over a period of say 30 minutes. For example: at 7:00PM dim to 90% at 7:05PM dim to 80% at 7:10PM dim to 70% at 7:15PM dim to 60% at 7:20PM dim to 60% etc until it turns off. so 10% dim every 5 minutes. It’s for a bird cage and I want to simulate sunset for them How can I do that? thank you.