something like this should work...havent tested it
var MINUTE = 60 * 1000
var HOUR = MINUTE * 60
var DAY = HOUR * 24
var WEEK = DAY * 7
var today = (new Date()).getTime()
var yesterday = new Date(today - (DAY * 1))
var twodaysago = new Date(today - (DAY * 2))
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