When did the allies start evacuating from the Dunkirk mole during the Dunkirk evacuation?

Question

I have two dates in mind, 22 May 1940 and and 27 May 1940. It makes more sense that they started evacuating from the mole the 22 of may but I've also heard the 27 from BBC.

The 22 of May was the date when Capt. Tennant arrived to Dunkirk and he was, if I'm correct, the one who ordered the evacuation from the Dunkirk mole.

I don't think that the 27 makes any sense because this means that Capt. Tennant would have waited five days (from the 22) before he made the order and time was not really something that they had a lot of during the evacuation. Which is correct?

Answer 1

Encyclopedia Britannica says May 26th

As you noted the BBC says May 27th

The History Channel says May 26th

Admiral Tennant, then Captain Tennant, arrived at Dunkirk on May 26th according to the BBC

And, the Worcester News says that Admiral Tennant arrived on May 26th

English Heritage has an interactive timeline saying the order was given May 26th, but the evacuation started on May 27th

I cannot find anything that says Tennant arrived on May 22nd. Looks like the order was given May 26th, but the boats started moving May 27th.