fdo#74745: Test Case for importing custom property of type date correctly in writer.

Change-Id: I61c7ec4953269a88f3edcebc5b81b01de5b8f3fc
Reviewed-on: https://gerrit.libreoffice.org/10132
Reviewed-by: Muthu Subramanian K <muthusuba@gmail.com>
Tested-by: Muthu Subramanian K <muthusuba@gmail.com>