min_resolution doesn't actually do anything...

[jesusbagpuss]

...other than display a different help message.

https://github.com/eprints/eprints/search?utf8=%E2%9C%93&q=min_resolution

When rendering a field with a min_resolution of day/month, the '0' value should be removed from that select.
https://github.com/eprints/eprints/blob/3.3/perl_lib/EPrints/MetaField/Date.pm#L128-L130
https://github.com/eprints/eprints/blob/3.3/perl_lib/EPrints/MetaField/Date.pm#L211-L216

If a date is already set, and falls below the min_resolution required, it should be allowed to stand - the software shouldn't impose things - but a human should be presented with only the options to allow them to select a valid value!