How to delete site column in custom columns group when it error "Field type Date is not installed properly"

Hi all,

I have a problem with using powershell of sharepoint 2010.

I created a site column is "Review Date" but I type error about Type="DAte", I should type is  Type="DateTime".

Now when I visit link "Site columns" it announce "Field type Date is not installed properly. Go to the list settings page to delete this field." 

Please help me to delete this site column. I don't use this site column in content type, i just created it.

I find ID of this site column but I don't know how to use it.

I'm from VietNam so my English is not well.