In PM's
Ingest dialogue box there is the option of
Incremental Ingest.
More can be read about PM's Ingest options
<here> in the
online manual.
The relevant section states:
"
Incremental Ingest: Copy new photos only checkbox: Photo Mechanic will keep track of all photos previously downloaded and will only download photos that have not been downloaded before. If you reformat your card in your camera, then all photos shot since the format will be downloaded."
While it doesn't allow you to choose to ingest photos from a specific date, it does avoid re-ingesting previous images.