Which writers share a birthday with Wimalaratne Kumaragama?

Whatever is the birthday (day of the year on which the date of birth fell) of Wimalaratne Kumaragama (January 18, 1919 - December 30, 1962), the prominent Sri Lankan poet, of the Colombo era is the birthday of which other writer, a person who produces literature or nonfiction, such as novels, short stories, plays, screenplays, poetry, essays, articles, or other literary arts?

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Show reasoning Reasoning

I followed this chain of reasoning:

I know from locally stored knowledge that:
the 18th of January is the birthday of Albert Kivikas ([fact: ["generated.866057564@trueknowledge.com"]])

permanent applies to is the birthday of ([fact: ["1152640@trueknowledge.com"]])

By calculation (generator: ["tpintersect@trueknowledge.com"]) I know that:
all time is the timeperiod intersection of all time and all time

By calculation (generator: ["same_left_value@trueknowledge.com"]) I know that:
Fact 1: Albert Kivikas is something with the same left value for the relation as is the birthday of and Wimalaratne Kumaragama

Fact 1 is true for all time

Therefore (generator: ["equals1@trueknowledge.com"]):
Albert Kivikas is not the same as Wimalaratne Kumaragama

I know from locally stored knowledge that:
Albert Kivikas is a writer ([fact: ["603739296@trueknowledge.com"]])

By calculation (generator: ["same_left_value@trueknowledge.com"]) I know that:
Fact 1: Charles de Secondat is something with the same left value for the relation as is the birthday of and Wimalaratne Kumaragama

Fact 1 is true for all time

Therefore (generator: ["equals1@trueknowledge.com"]):
Charles de Secondat is not the same as Wimalaratne Kumaragama

I know from locally stored knowledge that:
Charles de Secondat is a writer ([fact: ["681382812@trueknowledge.com"]])

I used the following facts to provide this answer:

Albert Kivikas is or has been a writer

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Charles de Secondat is or has been a writer

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