Are heyday and doomsday antonyms of one another?

I know doomsday means the end of the world, but is heyday like the happiest day ever? Can you provide an example sentence using heyday, please? Thanks.Are heyday and doomsday antonyms of one another?
Although they have conflicting meanings, they are not antonyms, as doomsday is the end of the world and is a single event that will pass in a complete and finite time period, whereas a heyday is a long and drawn out era during someones life when they are in their prime and at their most popular. For example, when referring to a particular celebrity, you may say: "she was in her heyday in the 1940's", as that was when she was at the height of her fame.

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