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Patch Blank Date to SharePoint Date Field

I am using a Gallery to Patch and Save to a SharePoint List, one of my fields is a date field (Closed Date).  The ForAll Patch doesn't save to SharePoint unless I have the Closed Date populated.  I want it to be blank until the item is updated.  How can I patch a blank date to SharePoint?


@Eelman My SP List field is a date field.  I'm creating a collection for a "Repeating Table" Gallery, each row in the Gallery has 2 date fields, one, Date Closed, will be able to update at a later time, so it needs to be blank.  It is Saved to the Collection as a blank entry and then when submitted to my SharePoint List, it doesn't submit the collection values to SP when the date field is blank. 

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This is what worked when submitting to SharePoint.


'Date Closed': If(IsBlank(LineDateClosed), Blank(), DateValue(LineDateClosed)),

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Frequent Visitor

I was able to successfully patch with the following: 


exit_date: DateValue(selectedHistoryItem.previous_value)


This value for the given record results in a Blank() value, but was able to patch successfully AFTER enabling the Formula-level Error Management as noted by  @Drrickryp  and @Eelman .


This formula will Patch either a Blank() or real date value, whichever the formula returns.

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