How can I start a flow by a specific time? I have a created a time-variable (msg.payload). Now I ask myself how can I start the flow at this variable time?
Take a look at flows.nodered.org where there are lots of timer nodes, some of which allow you to send a message to the node with the time
The cron+ node lets you send the time (specified in CRON format). Many of the timer nodes don't let you send a message to define the time.
I need exactly the opposite. 
I've packed the time into a variable and that's supposed to be done at the time.
I need exactly the opposite.
I doubt it. You "packed" the time into a variable, so instead of "packing" it in a variable, inject it in a cron node for example.
Explore this example, may be you'll get some ideas https://flows.nodered.org/flow/986e43672b35b4329d58ceb3d987596b
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Do you actually want to do something some time after the present time? In other words after a delay from now? If so then is it a fixed delay or variable?
I am trying to bulid a Power-On Switch for a lamp. The data where the lamp should be turned on comes from a calendar. So my Idea is, I read out the data of the calendar and extract the start date into a variable. The variable is the start button.
I'm not still quite sure how I can use the cron+ node for that.
Do you want to do that each day or read the calendar and set up a repeating schedule for the future?
Currently I have my calendar read out twice a day. But I'm just seperating the upcoming date. Exactly this date should turn on a lamp.
I would like to steer the lamp over a calendar entry, since I work in shift service I have irregular times.
Understood, so you want to trigger a one-off event at some time in the future.
I don't know of a one-shot timer node that will trigger at a defined time. Others may be able to suggest something.
I think I would probably do that in javascript using setTimeout(). Alternatively you could calculate how far in the future it is and then send the message to a delay node, telling the node how much to delay the message for. How to do that is described in the info panel for the Delay node.
The cron-plus node can be (dynamically) set via time or timestamp or string date time
IE. It doesn't have to be a Cron expression
Good Idea, Colin.
I will also check out cron+. I still haven't senn how can I handle it. But I'm brand new in Node-Red.
I also found a node called calendar trigger. That sound good to me as well.
And here is how to do it with time events. As there is always many ways to do it.
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Has anyone here experience with calendar trigger? Unfortunately, this does not work for me.
Yes, I do. I have incorporated it into a calendar flow. You need to parse the date in as an array, even if it is only an array of 1.
It works fine, but is rather limited. So I was forking/updating it, until someone else came along and made my efforts redundant. 
How can I parse the date into an array?
Take a look here https://www.w3schools.com/js/js_date_formats.asp at the proper formatting needed (specifically at the ISO Dates (Date-Time) section).
Once your date is formatted then just use msg.dates[0] = your properly formatted date in a Function node, and parse this to the Calendar-Trigger node.
As well as using a function node and JavaScript, you can do it with a change node and JSONata.
This is a guess, I haven't tried it but something like:
[payload]
might do the job. Assuming the data is on the payload.
