How to convert a numeric xs:gDay into a day name

Hello,

I just have what I hope is a simple question.

I have some dates in their numeric form, that is, the days are numbered
from 01 to 31. I'd like to convert them into their English equivalents -
Monday, Tuesday, etc. It's easy to do with months, 01 = January... but
with days, it varies from year to year and month to month. I have a
feeling this has been asked before but couldn't find a simple answer. Is
there any function or easy way to do this? Or even any complex way? :-)

Thanks for any help.

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