Hi Mark, thanks for raising this.
The NBN Atlas does restrict some date information for sensitive species, as part of our automatic screening process for sensitive species. The policy for how we deal with sensitive species is currently under review (and out for consultation to the Network), and we will address whether there is a need to restrict date information as well as location information. It'll be really useful to get your opinion on this. Do you feel that there is no need to restrict the date info?
More info on the draft policy can be found here: https://nbn.org.uk/news/nbn-sensitive-species-policy/ This draft doesn't currently address the topic of removal of date information, but it will be included in the next draft. If you have any specific details of this policy that you'd like to discuss, please email me directly (e.vogel@nbn.org.uk).
Cheers,
Ella