In a comment attached to a diagram here the following question was asked.
Here's a very quick reply.
Green vs. pink is a question that comes up from time to time. There's a few reasons why, but most are to do with over-emphasizing the datetime attribute of a pink.
For example, I'm a Person. I'm a green, right? Well I have a date of birth doesn't that make me pink? Well, no, I'm a Person, I'm a green. What about a building, that's a place. But a building has a date of construction (a moment) and maybe even a date of demolition (thus an interval)... No, a building is a place.
Cases like these are straightforward. If there's still confusion then look at the behavior. A pink moment-interval has that sense of business process associated, is often something we need to track, has a previous and a next, often has a calcTotal, recalcTotal, complete, cancel, and so on. A green does not.
Another case is when it is beyond the boundary or scope of our system (our model). Such as the real world, or something in an external system.
A system that ours integrates with has a time ordered series of pinks in it. It tracks the history. However, in our system we only ever have one of them. A snapshot. To us there is no history or sense of business process or tracking. Hence, in our model it is a green. In the PD of the other system it is a pink.
There are many places in the color modeling book where green classes have dates or intervals on them.