Moin is a versatile greeting:
* Morning: It's the most common use, like saying "Good morning"
* Afternoon: It can be used as a casual greeting in the afternoon as well.
* Evening: It's also acceptable to use "Moin" in the evening, but it's less common.
Note: It's important to know that "Moin" is considered very casual and friendly. It's best to avoid using it in formal situations.