K 10 svn:author V 3 ian K 8 svn:date V 27 2017-07-14T18:36:15.408648Z K 7 svn:log V 216 Minor optimization: instead of converting between days and years using loops that start in 1970, assume most conversions are going to be for recent dates and use a precomputed number of days through the end of 2016. END