[{_id:1,name:"example1",scheduledDate:"2022-04-15T05:44:00.000Z"},{_id:2,name:"example1",scheduledDate:"2022-04-15T07:44:00.000Z"},{_id:3,name:"example1",scheduledDate:"2022-04-18T02:44:00.000Z"},{_id:4,name:"example1",scheduledDate:"2022-04-18T02:20:00.000Z"},{_id:5,name:"example1",scheduledDate:"2022-04-18T02:44:00.000Z"},{_id:6,name:"example1",scheduledDate:"2022-04-10T05:44:00.000Z"}]

db.collection.aggregate([{$match:{}},{$group:{_id:{$dateTrunc:{date:{"$toDate":"$scheduledDate"},unit:"day"}},count:{$sum:1}}},{$match:{count:{$gt:1}}},{$project:{_id:0,scheduledDate:"$_id"}}])