Given the Swahili includes the word dakika, I'd say the minutes should be included in the English. There are plenty of sentences where variations should be accepted (but usually aren't). I don't think this is one of them.
Talked to my sister in Tanzania and she says they count by "solar time" sunrise is approximately 6am, so 7 is hour one. Still trying to figure out where the lesson referenced below is but that's the basic.