Include generation date in image metadata

Now that we have the 30-day rolloff in place for site-generated images, I need to see (ultimately) when I’ll lose work, or how much time I have left. Including the generation date in the metadata would be great. Currently the only date is attached to the generation task, not the image itself. This date doesn’t show in feed mode, which is what I use mostly due to sheer scroll size.

Thanks.