"It is eleven o'clock."
Translation:Mae hi'n un ar ddeg o'r gloch.
Un ar ddeg (11) is one of the traditional numbers, the 'deg' becomes 'ddeg' because of the preposition 'ar'.
'Un ar ddeg' and 'Deuddeg' (12) are parts of the old vigesimal number system that are still used for time.
Literally they mean 'one on ten'; 'two on ten'
On mobile, when selecting "'r" the voice thing says something like powllnodin. I don't know why or what it's on about