Dates and milk? Interesting combination. I've never, ever eaten dates actually!
Mashallah... I know how to use it, but not exactly what it means.
You use it when something good happened which is good (and I think when someone has done something for you?), so it's something like "Praise Allah"? But it doesn't mean "praise Allah" because that's "alhamdullilah", but it's the event, and God knows everything and nothing is outside His control... so.. at a guess, "God has brought it forth" or something about God allowing it?
I might be wrong, but I didn't check though!