Convert Number to Date in Presto

Question

I have a column in my table with the numerical equivalent to date in excel:

 TABLEA
 Col1
43276
43252
43253
43254

How do I convert this to a date in Presto? I want my final result to look like this:

      Col1
2018-06-25
2018-06-01
2018-06-02
2018-06-03

I attempted doing this but it gave results to 1970:

select *, date(from_unixtime(cast(Col1 as bigint))) as Col1 from TABLEA;