Warning in Legacy month field about hku-thesis-template

[monaen]

Hi,
Thanks for your question.

This one is a warning for the month item. According to the document biblatex package documentation

month
The publication month. This must be an integer, not an ordinal or a string. Don’t say month={January} but month={1}.
The bibliography style converts this to a language dependent string or ordinal where required.
This field is a literal field only when given explicitly in the data (for plain BibTeX compatibility for example).
(see page 24)

You should change the string to the integer

Hope this helps!

Best,

Nan