Katie,
Thanks for getting back so quickly. At the moment dates in Zotero are months names and year, e.g. July 2014. I am not sure why – we captured the papers from their publication websites so this is a zotero default I guess?
What is particularly odd about this is that papers with the same Zotero date are not adjacent in the ZotPress listing (e.g. Pechey et al and Hall & Marteau are both July 2014 publication).
I will see if there is a way to update the dates to y-m-d. This makes sense!
All the best
Suzanna