When entities with a timestamp device class have a unit of measurement (namely, "ISO8601"), they have a weird representation in UI. Dropping it makes an entity look more appealing. Additionally, it starts looking like other entities with the same device class.
When entities with a timestamp device class have a unit of measurement (namely, "ISO8601"), they have a weird representation in UI. Dropping it makes an entity look more appealing. Additionally, it starts looking like other entities with the same device class.
Before:
After:
Similar entity: