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How Do RSS Feed Readers Detect Feed Updates?

How do RSS feed readers detect updates to an RSS feed?

The most reliable way to make an existing item seem new or changed is to give it a new value in the GUID field. Some readers will check the date field, but others may not, your best bet is to include a unique GUID to let RSS feed readers know that a new item is available.

- RSS Knowledgebase Feed

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