[MongoDB]: How to truncate/chop off time-stamp from Date

How to truncate/chop off time-stamp from Date > db.dbversity.find({},{tradeDate:1}) { “_id” : “1”, “tradeDate” : ISODate(“2015-06-25T18:30:00Z”) } { “_id” : “2”, “tradeDate” : ISODate(“2015-06-25T18:30:00Z”) } { “_id” : “3”, “tradeDate” : ISODate(“2015-06-24T18:30:00Z”) } { “_id” : “4”, “tradeDate” : ISODate(“2015-06-23T18:30:00Z”)…