How do you add relationship properties, e.g. the time a person met another person?

I have some experience with Neo4j / cypher. In cypher relationships are first-class citizens, so they can have properties, which I really like.

I’m very new to datomic / datalog, sorry in advance if I’m asking a dumb question…
How do I do something similar with datomic? Or do I simply approach the problem from a wrong perspective and should learn a new way of thinking about this?