Database
[{"_id":ObjectId("608a6ee3e781511b7283c393"),"duration":0,"agent":"SIP/intellicon","queue":"sales","event":"LOGIN","startDateTime":"2021-04-29 13:27:21",/**String Type*/"endDateTime":"0000-00-00 00:00:00",/**String Type*/"channel":"fb_pages","__v":0,"createdAt":ISODate("2021-04-29T08:31:31.995Z"),"updatedAt":ISODate("2021-04-29T08:31:31.995Z")}]
Query
db.collection.aggregate([{$project:{convertedStartDateTime:{$toDate:"$startDateTime"}}}])