First of Year

I am often searching my blog for the time I notice some natural event, the first snowdrop, cuckoo or the like. This requires looking through a few posts. I though I could make something that woud search and sort by day and month, not year. This is it:
Search

I do not know if this is a very cleverer way to go about this, it uses the WordPress Rest API to search then sorts. It is a simple plugin at the mo with a [firstofyear] shortcode to get the search box.