Ping API for updated date only

I'm writing an export that uses api.zotero and will cron it. I don't want to tax zotero servers needlessly, but don't see how to get the last "updated" date only for a group from the server.

I'm using:


https://api.zotero.org/groups/######/items?key=XXXXXXXXXXXXXXXXXX&format=atom&content=bib


for each call, and pulling the date from that - but that seems overkill when all I need initially is JUST the updated date for the group...
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