Delete date value SharePoint List

[DanielK]

Thank you, it works.

[ktvision · Accepted solution]

My post below used to be working fine, but it is not working anymore.

Here is the new solution that someone posted.  https://powerusers.microsoft.com/t5/General-Discussion/Update-blank-Null-value-to-fields-Date-User-C...

Don't follow the direct below.

If you haven't figure it out.  Here is the solution for you.

Update the Default Value and On change properties as below.  It works well.  Hope it helps you.

In the PowerApp,

Date picker Name : dDue

Create a Variable: vDate 

Default Value	If(vDate="Empty",Blank(), If(vDate="NotEmpty", dDue.SelectedDate, Parent.Default ))
On Change	If(IsBlank(dDue), Set(vDate, "Empty"), Set(vDate, "NotEmpty"))