Comment 0 for bug 397387

Item::update_excerpt autogenerates $excerpt and sets it to the object, which gets updated in DB if changed/generated.

This leads to post_datemodified also being updated.

This causes items to get the current timestamp as "last modified", if some web spider crawls your archives (where excerpts of old items get displayed (and auto-generated)).

The fix might be to tell DataObject::dbupdate that this change should not touch $datemodified_field.