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robcowie / mongo_mapreduce_by_week.js
Created May 4, 2010 15:18
mongodb map-reduce to group by week
m = function() {
var getWeek = function(d) {
/*getWeek() was developed by Nick Baicoianu at MeanFreePath: http://www.meanfreepath.com */
dowOffset = 1;
var newYear = new Date(d.getFullYear(),0,1);
var day = newYear.getDay() - dowOffset;
day = (day >= 0 ? day : day + 7);
var daynum = Math.floor((d.getTime() - newYear.getTime() - (d.getTimezoneOffset()-newYear.getTimezoneOffset())*60000)/86400000) + 1;
var weeknum;
if (day < 4) {