Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_38229 ( "Date" text, "Tournament" text, "Surface" text, "Opponent in the final" text, "Score" text )

### Question ###
What is the date for the grass surface final against Nathan Healey?

### Accurate SQL ###

SELECT "Date" FROM table_38229 WHERE "Surface" = 'grass' AND "Opponent in the final" = 'nathan healey'