Set calculated date field to null in podio (and thus with javascript) - javascript

Here's the issue with Podio. I have a calculation field that is set to return a date and it does that well if I only enter a reference to a date field from the item. What I want is for the calculation field to return a null date (as part of an IF statement) and thus leave or make the field empty (and therefore not show up in the calendar).
Something like this:
var date = DateFieldFromPodioItem;
if (whatever) {
moment(date).add(2, "weeks").toDate();
}
else {
//RETURN NULL HERE
};
I have tried setting var zero = null and have it return that. Which yields me an Invalid date error.
I also tried using .setFullYear(null,null,null) along with .setHours(null,null,null,null) to set date and return that. I set date to 1 January 0001 12:00:00.000 AM as was suggested somewhere (I forgot where I read that). The first got me a rather unfriendly: Invalid value datetime.datetime(1753, 9, 12, 22, 43, 41, 128000) (datetime): Dates before year 1900 are not supported. The second did too, with slightly different numbers within the ().
I even tried the rather silly idea of entering no code within else, but that also returns Invalid date.
Any ideas?
----EDIT----
Turns out that even while Podio shows the message Invalid date it lets you save the field anyway and when changing field values so if=false it shows no longer a date in the calculation field. Thanks to Rainer Grabowski for pointing that out to me. If someone #Podio reads this, perhaps fix that?
I'll leave this here to perhaps help someone else, as I have found the answer to my questions on here rather often.

Should work, but I didn't test:
var date = DateFieldFromPodioItem;
var returnValue = null;
if (whatever) {
returnValue = moment(date).add(2, "weeks").toDate();
}
returnValue;

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Restrict changing a date field to further date from its current value Dynamics CRM?

I want to achieve the following, restrict changing a date field to further date from its current value, in Dynamics CRM via JavaScript.
Below is my JavaScript code, im pretty new to JavaScript Dynamics development, below is my code, by the way its not throwing an alert, is it coded properly? - apologies if the question doesnt make sense.
Why isn't it throwing an alert, when I enter a date future from current value?
function test(executionContext) {
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the JavaScript code is correct, you may want to check the field name (the one you are assigning to fielddate variable) because if it's null then your code is not executed.
Instead of alert I would write
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because it's the supported way to display alerts (https://learn.microsoft.com/en-us/powerapps/developer/model-driven-apps/clientapi/reference/xrm-navigation/openalertdialog)
after the message you should also clear the field, so the user can set a new value (otherwise the wrong value will be stay there)
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Whenever I try to reset a date input using JavaScript, like so:
//input_id is an id of a date input
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I get a warning in the console:
The specified value "0000-00-00" does not conform to the required format, "yyyy-MM-dd".
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var di = document.createElement("input");
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At the bottom of your Javascript call
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I'm having difficulty setting a time (duration) value in a datebox. A simple demonstration of the problem is if I do something like:
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Because of the first problem the last 2 lines in initDuration() don't do what I want. i.e. they just use the current time, whatever that happens to be.
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For the title - give "overrideHeaderText" a shot instead. It is entirely possible that I screwed this up at some point, it's not a feature I use in any of my own projects.
Next...
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I am using the following code to remove commas from an integer (whole number) field in CRM 2011:
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