mongodb Date conversion quert

need to convert all the below date formats to a standard ISO format, but i need the existing dates to be just the way they are. the query i am writing is updating everything to todays date.. /* 1 */ { "_id": ObjectId ("hadjadjhjdch"), "scriptName": "Name IS Somethinng", "scriptType": "Open Account", "URL": "https://bksfbsff", "date": "1536685291262" /*2 */ "_id": ObjectId ("ljkhksfach"), "scriptName": "Name IS SomeOtherthinng", "scriptType": "Open Account", "URL": "https://bksfbsffdsJF", "date": "2018-08-22T18:17:39.506" /*3 */ "_id": ObjectId ("WTDHGVjjch"), "scriptName": "Name IS nothing", "scriptType": "Saving Account", "URL": "https://bksfbhkshsff", "date": ISODate("2018-04-04T20:51:42.3782")