[{"_id":ObjectId("665e1e9f2c8963573b18c261"),"timestamp":ISODate("2024-06-17T13:00:00.000Z")},{"_id":ObjectId("665e1e9f2c8963573b18c262"),"timestamp":ISODate("2024-06-17T20:00:00.000Z")}]

db.collection.update({$expr:{$eq:[13,{"$hour":"$timestamp"}]}},[{"$set":{"timestamp":{"$dateFromParts":{"year":{"$year":"$timestamp"},"month":{"$month":"$timestamp"},"day":{"$dayOfMonth":"$timestamp"},"hour":{"$hour":"$timestamp"},"minute":{"$minute":"$timestamp"},"second":{"$second":"$timestamp"},"timezone":"-0700"}}}}],{multi:true})