pubDate property
The most recent date when any content within the channel changed.
A content change might refer to the addition of an item, or
it might refer to a change to the channel title, description, etc.
In typical cases, pubDate matches lastBuildDate because a recreation of the RSS feed typically happens for the purpose of updating content. However, there may be cases where the feed is recreated without a content change, in which case pubDate will be behind lastBuildDate.
Implementation
final String? pubDate;