I want to initialize a list in a SharePoint Online Add-in with the following XML:

<?xml version="1.0" encoding="utf-8"?>
  <Elements xmlns="http://schemas.microsoft.com/sharepoint/">
    <ListInstance Title="Punchlist Items" OnQuickLaunch="FALSE" TemplateType="100" Url="Lists/Punchlist Items" Description="">
            <Field Name="Title">This is an open punchlist item</Field>
            <Field Name="PunchlistNumber">AHU0101-PL-0001</Field>
            <Field Name="Open">2015-01-02T00:00:00Z</Field>
            <Field Name="TypeId">1</Field>
            <Field Name="GMP">true</Field>
            <Field Name="ResponsibleId">1</Field>
            <Field Name="Closed"></Field>

But I'm receiving an error:

String was not recognized as a valid DateTime

When the Closed field is empty (it works fine if I give Closed a value like 2015-01-02T00:00:00Z). Is there a way to create the row with an empty DateTime field? I don't want a value in the Closed field and it is not a required field.

  • 1
    Check by removing Closed field entry from your XML and see if it works.
    – Pradip R.
    Jan 11, 2018 at 13:21
  • 1
    That's it - thank you. If you post it as as an answer I'll accept
    – dikuw
    Jan 11, 2018 at 13:27

1 Answer 1


Remove the Closed field from that XML Row and you will no longer get the error mentioned and it will be stored as an empty.

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