If you listen to your first post the song words say 7th of June but as today is the 7th both dates are covered. Paul Brandt, the other Convoy song specialist, used 6th of June but the original C.W. McCall did his early runs on the 7th but he started calling the 6th after a while because it rhymed better. Anyhow that's what some music expert tells us, I would not really know.
Here is someone else's take. This is apparently THE original.
And rightly so, like any hit song at the time.
Didn't mind "round the world with the rubberduck" Love the lines" the British had 100 mlie tea", and the "Autobahn being the ultimate slab and punching 13". The German stating they are travelling to slow.
Liked the way he told a story even if it was silly.
Funny when you're a kid at the time.
In order that the labour of centuries past may not be in vain during the centuries to come... D. Did