Problem with Date

I am trying to store the day that information was last updated. I can get it to display the date fine by using date( "jS F Y") - but I cannot get it to write that to the database. What am I doing wrong? I have tried setting the field in the database as datetime, char, and nvarchar. I don't get an error when I try to write to the database. It just ends up being blank in the database. Anyone have a clue??