Default calculated value for datetime field in xml

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How to specify a calculated value for a SharePoint custom field in its XML schema?

Like this:
 <Field
    Type="DateTime"
    Format="DateOnly"
    DisplayName="ExpiryDate"
    Required="FALSE"
    EnforceUniqueValues="FALSE"
    Group="My Group"
    ID="{99668BDC-5DED-46d0-A4EC-360237966F52}"
    StaticName="ExpiryDate"
    Name="ExpiryDate">
    <DefaultFormula>[today]+60</DefaultFormula>
  </Field>