MongoDB aggregate query that projects the current date without hours, seconds and milliseconds

nowDateOnly.js

Podcast.aggregate([
	{
		$project: { 
			now: new Date()
		}
	},
	{
		$project: { 
			nowDateOnly: {
				$subtract:[
					'$now', {
						$add: [
							{		 
								$multiply: [{$hour: "$now"},3600000]
							},
							{
								$multiply: [{$minute: "$now"},60000]
							},
							{
								$multiply: [{$second: "$now"},1000]
							},
							{
								$millisecond: "$now"
							}
						]
					}
				]
			}
		}
	},
]);