Angular Filter by Date/Time Range

Angular Filter by Date/Time Range

I'm trying to build a date filter by passing in a time range (e.g. Past
Week, Past Month, etc)
$scope.eventDateFilter = function(column) {
if(column === 'today') {
$scope.dateRange = $scope.dateToday;
} else if (column === 'pastWeek') {
//need logic
} else if (column === 'pastMonth') {
//need logic
} else if (column === 'future') {
//need logic
} else {
$scope.dateRange = "";
}
}
Here's my fiddle: http://jsfiddle.net/c6BfQ/3/
Your help is greatly appreciated.