calculate a timeperiode in days (X days until Chrismas)

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I want to have a vaiable which shows me the count of days to next chrismas ( for example 24.12.2017).
Is there a way to achieve this by making a rule which calculate a variable every day?

Hope this is understandable

greetings Toinmahoni

You could use ShellSensor to execute:

echo $(($(date -d 24-Dec +%j) - $(date +%j))) days left until christmas

cheers

DerIng

Thank’s very much, that works great.
But now I want to have a variable Input Device, whicht gets a Date. (I want to have a cuple of variables with Birthdates. Is there a way to use a variable to output the left days?
For example something like:

echo $(($(date -d VARIABLE +%j) - $(date +%j))) days left until christmas

VARIABLE = “24-Dec”

greetings
Tonimahoni

well, you can try to create a variablesinput device and use it in your above echo command as you already stated.

echo $(($(date -d $VARIABLE +%j) - $(date +%j))) days left

$VARIABLE must be changed to the name of your variablesinput device then.
not sure if this works but worth a try.