Subtract 5minuts from a time out of a state node

Third party integrations Node-RED
1

Hello,

This is my first post on this forum. I’m rather new to nodered and looked at severall youtube tutorials, but can’t find the answer on my problem.

I’m creating a flow in what has to do the following:

  • When i change my alarm on my mobile it has to get the wakeup time;
  • After this it has to subtract 5minuts of the set time;
  • On the time minus 5minuts i want to have my lights go on, on 40%;
  • On the set time the lights go brighter on 70%.

I catch the new alarm time with a state node, and it looks like:

ha_nodered_ alarm_capture
ha_nodered_ alarm_capture447×949 22.2 KB

How can i use the newly set time (“attributes”:{“Local Time”:“Sat Mar 06 05:10:00 GMT+01:00 2021”) and subtract the 5 minuts of of it, to turn the light on on the subtracted time?
Hoping someone could give me some plain and simpel examples.

Thanks in advance

2

Have you looked at the time node? https://zachowj.github.io/node-red-contrib-home-assistant-websocket/node/time.html

You could have two nodes one with an offset -5 that turns on the lights to 40% and one without an offset that turns the lights on to 70%.

3

Im using this flow for years now, and works fine:

image
image751×143 11.7 KB

[
    {
        "id": "5fd4bf94.3d203",
        "type": "join",
        "z": "1de400c0.5ce76f",
        "name": "",
        "mode": "custom",
        "build": "array",
        "property": "payload",
        "propertyType": "msg",
        "key": "topic",
        "joiner": "\\n",
        "joinerType": "str",
        "accumulate": false,
        "timeout": "",
        "count": "2",
        "reduceRight": false,
        "reduceExp": "",
        "reduceInit": "",
        "reduceInitType": "",
        "reduceFixup": "",
        "x": 810,
        "y": 180,
        "wires": [
            [
                "3baa06b3.7b18fa"
            ]
        ]
    },
    {
        "id": "3baa06b3.7b18fa",
        "type": "function",
        "z": "1de400c0.5ce76f",
        "name": "Compare Times",
        "func": "newmsg = {};\nif (msg.payload[0] == msg.payload[1]) {\n    newmsg.payload = \"True\";\n} else {\n    newmsg.payload = \"False\";\n}\n\nreturn newmsg;",
        "outputs": 1,
        "noerr": 0,
        "x": 960,
        "y": 180,
        "wires": [
            [
                "69f8941b.a2457c"
            ]
        ]
    },
    {
        "id": "69f8941b.a2457c",
        "type": "switch",
        "z": "1de400c0.5ce76f",
        "name": "Is it Time?",
        "property": "payload",
        "propertyType": "msg",
        "rules": [
            {
                "t": "eq",
                "v": "True",
                "vt": "str"
            }
        ],
        "checkall": "true",
        "repair": false,
        "outputs": 1,
        "x": 1120,
        "y": 180,
        "wires": [
            [
                "1123ea0c.e5c056"
            ]
        ]
    },
    {
        "id": "cb3ff133.0f556",
        "type": "api-current-state",
        "z": "1de400c0.5ce76f",
        "name": "Get Alarm Time",
        "server": "2fba4297.e4145e",
        "version": 1,
        "outputs": 1,
        "halt_if": "",
        "halt_if_type": "str",
        "halt_if_compare": "is",
        "override_topic": true,
        "entity_id": "input_datetime.alarm",
        "state_type": "str",
        "state_location": "payload",
        "override_payload": "msg",
        "entity_location": "data",
        "override_data": "msg",
        "blockInputOverrides": false,
        "x": 460,
        "y": 120,
        "wires": [
            [
                "ed1570d4.2671d"
            ]
        ]
    },
    {
        "id": "ed1570d4.2671d",
        "type": "moment",
        "z": "1de400c0.5ce76f",
        "name": "Alarm - 10min",
        "topic": "",
        "input": "payload",
        "inputType": "msg",
        "inTz": "Europe/Berlin",
        "adjAmount": "10",
        "adjType": "minutes",
        "adjDir": "subtract",
        "format": "YYYY-MM-DD HH:mm",
        "locale": "C",
        "output": "payload",
        "outputType": "msg",
        "outTz": "Europe/Berlin",
        "x": 640,
        "y": 120,
        "wires": [
            [
                "5fd4bf94.3d203"
            ]
        ]
    },
    {
        "id": "c2b4d347.fde2",
        "type": "moment",
        "z": "1de400c0.5ce76f",
        "name": "Current Time",
        "topic": "",
        "input": "payload",
        "inputType": "msg",
        "inTz": "Europe/Berlin",
        "adjAmount": "0",
        "adjType": "minutes",
        "adjDir": "subtract",
        "format": "YYYY-MM-DD HH:mm",
        "locale": "C",
        "output": "payload",
        "outputType": "msg",
        "outTz": "Europe/Berlin",
        "x": 630,
        "y": 180,
        "wires": [
            [
                "5fd4bf94.3d203"
            ]
        ]
    },
    {
        "id": "2fba4297.e4145e",
        "type": "server",
        "name": "Home Assistant",
        "legacy": false,
        "addon": true,
        "rejectUnauthorizedCerts": true,
        "ha_boolean": "y|yes|true|on|home|open",
        "connectionDelay": true
    }
]