Currently, the "Last Modified" is saved by index-more plugin as long and Field.UnIndexed(). You need to make it indexed first and cook a query plugin to search for it. I planned to do a query-more plugin (for content-type, content-length as well as last-modified), but never got around to do it and won't have time soon. It will be great if you can contribute along the line.
I think an indexed date field would be great to have. It should be the last-modified, and, when the server does not provide that, it should default to the fetch date.
For performance it would be nice if this fit into an int. Storing only minute-level resolution would be sufficient to achieve this.
Doug
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