fix timestamps not being compared properly, when loading a .less
fix timestamps not being compared properly, when loading a .less

CartoDB/carto,clhenrick/carto,midnightcomm/carto,whitelynx/carto,mapbox/carto,pnorman/carto,gravitystorm/carto,madeinqc/carto,stefanklug/carto,CartoDB/carto,1ec5/carto,tomhughes/carto