"CreatedDate_Hour_3": {
            "datasets": [
                {
                    "id": "0Fb32000000TVRzCAO",
                    "label": "Case_Article_Survey",
                    "name": "Case_Article_Survey",
                    "url": "/services/data/v38.0/wave/datasets/0Fb32000000TVRzCAO"
                }
            ],
            "isFacet": true,
            "isGlobal": false,
            "action": "computeExpression",
            "parameters": {
                "source": "CreatedDate_Hour_3",
                "mergeWithSource": true,
                "computedFields": [
                    {
                        "name": "CreatedDateNew",
                        "type": "Date",
                        "format": "MM/dd/yyyy",
                        "saqlExpression": "toDate(CreatedDate_Hour_3 - 8*3600)"
                    }
                ]
            },
            "query": {
                "pigql": "q = load \"Case_Article_Survey\";\r\nq = group q by 'CreatedDateNew';\r\nq = foreach q generate 'CreatedDateNew' as 'CreatedDateNew', count() as 'count';\r\nq = order q by 'CreatedDateNew' asc;\r\nq = limit q 2000;",
                "measures": [
                    [
                        "count",
                        "*",
                        "count"
                    ]
                ],
                "measuresMap": {},
                "autoFilter": true,
                "groups": [
                    "CreatedDateNew"
                ]
            },
            "selectMode": "single",
            "type": "aggregateflex",
            "useGlobal": false,
            "visualizationParameters": {
                "options": {}
            }
        },

I am getting an error that says "This widget can't be displayed because of a problem with the underlying step, CreateDate_Hour_3."

 "CreatedDate_Hour_3": {
            "datasets": [
                {
                    "id": "0Fb32000000TVRzCAO",
                    "label": "Case_Article_Survey",
                    "name": "Case_Article_Survey",
                    "url": "/services/data/v38.0/wave/datasets/0Fb32000000TVRzCAO"
                }
            ],
            "isFacet": true,
            "isGlobal": false,
            "query": {
                "pigql": "q = load \"Case_Article_Survey\";\r\nq = group q by 'CreatedDate_Hour';\r\nq = foreach q generate 'CreatedDate_Hour' as 'CreatedDate_Hour', count() as 'count';\r\nq = order q by 'CreatedDate_Hour' asc;\r\nq = limit q 2000;",
                "measures": [
                    [
                        "count",
                        "*",
                        "count"
                    ]
                ],
                "action": "computeExpression",
                "parameters": {
                    "source": "CreatedDate_Hour",
                    "mergeWithSource": true,
                    "computedFields": [
                        {
                            "name": "CreatedDate_Hour_adjusted",
                            "type": "Datetime",
                            "format": "MM/dd/yyyy HH:mm:ss",
                            "saqlExpression": "toDate(CreatedDate_Hour  - 8*3600)"
                        }
                    ]
                },
                "measuresMap": {},
                "autoFilter": true,
                "groups": [
                    "CreatedDate_Hour"
                ]
            },
            "selectMode": "single",
            "type": "aggregateflex",
            "useGlobal": false,
            "visualizationParameters": {
                "options": {}
            }
        },

This code is not subtracting 8 hours from CreatedDate_Hour.