This thread spurred me on enough to follow through with the idea i posted in SOLR-397 a while back. I've attached a patch to that issue if you want to try it out...
https://issues.apache.org/jira/browse/SOLR-397 It adds a "facet.date.include" param that supports the following options: all, lower, upper, edge, outer ... * lower = all gap based ranges include their lower bound * upper = all gap based ranges include their upper bound * edge = the first and last gap ranges include their edge bounds (ie: lower for the first one, upper for the last one) even if the corrisponding upper/lower option is not specified * outer = the FacetDateOther.BEFORE and FacetDateOther.AFTER ranges should be inclusive of their bounds, even if the first or last gap ranges already include thouse boundaries. * all = shorthand for lower, upper, edge, and outer ...for back compat, the defualt is [lower,upper,edge] (ie: the gap based ranges include both endpoints, but before & after do not) -Hoss
