请教NR-如何计算时间差 谢谢

innx

研究了快2个礼拜还是基础太差搞不定，来请教大佬。谢谢mqtt接收到的信息：

{"Time":"2020-11-18T22:02:02","Switch1":"OFF","Switch2":"OFF","BH1750":{"Illuminance":23}}

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想用上面的时间减去现在的时间得到时间差，得出比如30秒还是xx天前
思路如下：
首先提取mqtt接收到的时间，把时间格式化后作为函数计算，但是输出的结果一直报错。
函数如下：

var end = msg.payload;   // 把上面处理好的时间定义为end
flow.set("endTime", end);
var now = new Date();   // 获取现在时间
flow.set("startTime", now);
msg.payload = flow.get("endTime") - flow.get("startTime");
return msg;

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[
    {
        "id": "626419e.d192ee8",
        "type": "json",
        "z": "97e6cc8.406613",
        "name": "",
        "property": "payload",
        "action": "",
        "pretty": true,
        "x": 450,
        "y": 1080,
        "wires": [
            [
                "ae737359.9fd91"
            ]
        ]
    },
    {
        "id": "ae737359.9fd91",
        "type": "function",
        "z": "97e6cc8.406613",
        "name": "",
        "func": "msg.payload = msg.payload.Time\n\nreturn msg;\n",
        "outputs": 1,
        "noerr": 0,
        "initialize": "",
        "finalize": "",
        "x": 590,
        "y": 1080,
        "wires": [
            [
                "4e19d992.eea4d8"
            ]
        ]
    },
    {
        "id": "4e19d992.eea4d8",
        "type": "change",
        "z": "97e6cc8.406613",
        "name": "",
        "rules": [
            {
                "t": "change",
                "p": "payload",
                "pt": "msg",
                "from": "T",
                "fromt": "str",
                "to": " ",
                "tot": "str"
            },
            {
                "t": "change",
                "p": "payload",
                "pt": "msg",
                "from": "-",
                "fromt": "str",
                "to": "/",
                "tot": "str"
            }
        ],
        "action": "",
        "property": "",
        "from": "",
        "to": "",
        "reg": false,
        "x": 740,
        "y": 1080,
        "wires": [
            [
                "15c9257c.975feb"
            ]
        ]
    },
    {
        "id": "15c9257c.975feb",
        "type": "function",
        "z": "97e6cc8.406613",
        "name": "",
        "func": "var end = msg.payload;   // current time\nflow.set("endTime", end);\nvar now = new Date();   // current time\nflow.set("startTime", now);\nmsg.payload = flow.get("endTime") - flow.get("startTime");\nreturn msg;",
        "outputs": 1,
        "noerr": 0,
        "initialize": "",
        "finalize": "",
        "x": 910,
        "y": 1080,
        "wires": [
            [
                "1e2918f.ff8cbe7"
            ]
        ]
    },
    {
        "id": "1e2918f.ff8cbe7",
        "type": "debug",
        "z": "97e6cc8.406613",
        "name": "",
        "active": true,
        "tosidebar": true,
        "console": false,
        "tostatus": false,
        "complete": "true",
        "targetType": "full",
        "statusVal": "",
        "statusType": "auto",
        "x": 1050,
        "y": 1080,
        "wires": []
    },
    {
        "id": "b901838f.f7287",
        "type": "mqtt in",
        "z": "97e6cc8.406613",
        "name": "",
        "topic": "tele/tasmota_EF82BE/STATE",
        "qos": "2",
        "datatype": "auto",
        "broker": "36c984ba.5428ec",
        "x": 200,
        "y": 1080,
        "wires": [
            [
                "626419e.d192ee8"
            ]
        ]
    },
    {
        "id": "36c984ba.5428ec",
        "type": "mqtt-broker",
        "z": "",
        "name": "",
        "broker": "192.168.7.7",
        "port": "1883",
        "clientid": "Node-red",
        "usetls": false,
        "compatmode": false,
        "keepalive": "60",
        "cleansession": true,
        "birthTopic": "",
        "birthQos": "2",
        "birthPayload": "",
        "closeTopic": "",
        "closeQos": "2",
        "closePayload": "",
        "willTopic": "",
        "willQos": "2",
        "willPayload": ""
    }
]

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目前照样画葫芦的看了下面2个文章还是搞不定
https://bbs.hassbian.com/thread-9481-1-1.html

https://blog.csdn.net/xinyi_jin/article/details/88047165

tcwj2008

var payload = msg.payload;   // 假设这个为类似这样的格式的时间"2020-11-18T22:02:02"
var last = (new Date(payload)).valueOf()
var now = (new Date()).valueOf();   // 获取现在时间
var ms = now - last //ms为两者之间的毫秒数

neroxps

换成时间戳减去再换回格式化时间就好了啊

innx

tcwj2008 发表于 2020-11-19 10:51
var payload = msg.payload;   // 假设这个为类似这样的格式的时间"2020-11-18T22:02:02"
var last = (new  ...

感谢回复
msg.payload的时间为 2020-11-19T18:41:42

var payload = msg.payload;   // 假设这个为类似这样的格式的时间"2020-11-18T22:02:02"
var last = (new Date(payload)).valueOf()
var now = (new Date()).valueOf();   // 获取现在时间
var ms = now - last //ms为两者之间的毫秒数
return msg;

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输出的结果还是 "2020-11-19T18:42:12"

innx

neroxps 发表于 2020-11-19 10:47
换成时间戳减去再换回格式化时间就好了啊

版主，这个思路我理解，但是基础太差都不知道用什么函数，有参考文章吗？

innx

tcwj2008 发表于 2020-11-19 10:51
var payload = msg.payload;   // 假设这个为类似这样的格式的时间"2020-11-18T22:02:02"
var last = (new  ...

搞定了！！！感谢！！！
想了一下ms的定义没有被定义到payload
加了2行就可以了  感谢！！！

msg.payload = ms/1000;
return msg;

innx

tcwj2008 发表于 2020-11-19 10:51
var payload = msg.payload;   // 假设这个为类似这样的格式的时间"2020-11-18T22:02:02"
var last = (new  ...

已经放弃了发现我考虑欠缺，函数没问题可以用在其他需要计算时间的地方可以参考。做这个时间差是想监控设备的，比如说设备死机了，我能知道什么时候发生的。
我用设备发出的mqtt作为触发源，设备死机后不更新数据，就一直停留在那一刻了。
是不是应该吧这个时间储存起来，用nr的每一分钟触发功能减去上一次上报的时间。

再次感谢高手的回复。

tcwj2008

innx 发表于 2020-11-19 22:59
已经放弃了发现我考虑欠缺，函数没问题可以用在其他需要计算时间的地方可以参考。做这个时间差是想监控设备 ...

是的，mqtt给的信息就存储下来时间，再用inject循环发送，用之前的代码检查时间差就可以了

guitengyue

参考你发的那个csdn的搞定了
https://bbs.hassbian.com/thread-12496-1-1.html

guitengyue

innx 发表于 2020-11-19 22:59
已经放弃了发现我考虑欠缺，函数没问题可以用在其他需要计算时间的地方可以参考。做这个时间差是想监控设备 ...

mqtt触发，记录时间
获取当前时间，做差
你就当参我那个洗衣机吧，几乎一模一样