Unable to import deals with Closing Date

Unable to import deals with Closing Date

Hi,

I am trying to import some deal rows from an excel file. It asks me for a Closing Date column and I have two problems -
1) Even though I have populated this column on my excel with a date, the import keeps rejecting them (skipped) and the error reason is that the column value is being picked up as empty 
2) I actually in the first place don't want to enter dates for this column for all rows since not all my rows are closed yet - but it seems that column cannot be empty

Can someone please help.

Thanks,
Shreya.