node-red时区问题解决方案对比

node-red时区问题

  • 一、问题描述
  • 二、node-red修改时区的两种方法
    • 2.1 通过安装moment节点修改 - 少量时选择
    • 2.2 通过date函数修改 - 批量时选择

一、问题描述

  在实际操作中,我们从前端传递时,还是中国时间,但是到了node-red中,就少了8小时,出现时区不对应的情况。

  • 确认node-red时区:在node-red中输出当前时间,发现Node-red的容器内时间正常,Node-red输出的时间戳也是当前的时间。排除node-red本身时区问题。

  Node-RED默认使用UTC时区,如果想更改时区,你可以在运行Node-RED时通过TZ变量来传入你期望的时区。

  • 在数据库端查询,查看查询输出结果,结果正常,排除数据库本身时区设置问题。
  • 通过node-red使用http://rest查询tdengine数据库,返回的时间格式与实际时间少了8小时。需要修改时区。

回到目录

二、node-red修改时区的两种方法

  node-red修改时区有两种方法,一种是通过moment节点修改,一种是通过date函数修改。

1. 方法对比如下:

  • 第一种方式更通用,能支持多种格式的互相转换,但是转换速度慢,对于大数据量数组的转换需要消耗较长时间和资源。(批量转换10万条数据时,耗时0.5秒)
  • 第二种方式适应性较差,需要指定固定的时区进行转换,但是转换速度快,效率高。(批量转换1万条数据时,耗时1.4秒)

2. 总结:

  • 对于大数据量的数组循环批量时,推荐第二种
  • 对于单次或少量的转换时,推荐第一种

方法详情如下:

2.1 通过安装moment节点修改 - 少量时选择

  1. 安装node-red-contrib-moment节点
  2. 使用moment节点,将时间字符串进行转换,格式示例如下:
    node-red时区问题解决方案对比_第1张图片

moment节点详细操作参考链接:读取时间的节点 node-red-contrib-moment

  1. js代码详情:
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        "repeat": "",
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        "once": false,
        "onceDelay": 0.1,
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        "type": "function",
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        "outputs": 1,
        "noerr": 0,
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        "finalize": "",
        "libs": [],
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        "y": 480,
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    {
        "id": "5cfd0bcf779ca93b",
        "type": "moment",
        "z": "411470ea6ab023d5",
        "name": "时区转换",
        "topic": "",
        "input": "dateStr",
        "format": "YYYY-MM-DD HH:mm:ss.SSS",
        "locale": "en-US",
        "output": "dateStr",
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        "wires": [
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        "name": "function 7",
        "func": "msg.t = \"耗时:\" + ((new Date().getTime() - msg.t) / 1000) + \"秒\";\nreturn msg;",
        "outputs": 1,
        "noerr": 0,
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        "libs": [],
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        "wires": [
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        "z": "411470ea6ab023d5",
        "name": "function 8",
        "func": "msg.dateStr = msg.data[msg.id][0].toUpperCase();\nreturn msg;",
        "outputs": 1,
        "noerr": 0,
        "initialize": "",
        "finalize": "",
        "libs": [],
        "x": 420,
        "y": 600,
        "wires": [
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        "id": "6e8f4da78a919e81",
        "type": "function",
        "z": "411470ea6ab023d5",
        "name": "function 9",
        "func": "msg.data[msg.id][0] = msg.dateStr;\nreturn msg;",
        "outputs": 1,
        "noerr": 0,
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        "x": 700,
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        "wires": [
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]

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2.2 通过date函数修改 - 批量时选择

var d = new Date(dateStr)
d.setHours(d.getHours() + 8);//将时加8
let s = d.toISOString().replace("T", " ").replace("Z", "");//去掉S T的时间格式

示例js代码如下:
node-red时区问题解决方案对比_第2张图片

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        "type": "debug",
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        "name": "debug 35",
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        "statusVal": "",
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        "type": "function",
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        "libs": [],
        "x": 430,
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        "wires": [
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        "active": true,
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        "statusVal": "",
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        "y": 400,
        "wires": []
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        "z": "411470ea6ab023d5",
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        "outputs": 1,
        "noerr": 0,
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]

回到目录

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