referencing column names properly - Mailing list pgsql-sql

I have a table called logs with several columns whose names have '-' in
them, e.g.   User-Name

I'm having trouble referencing these columns with SELECT statements.

What would the proper way to address these in a statement like this?

SELECT User-Name, max(Date), max(Time) from logs;

I want to return the last login date and time for each username.

Thanks
Stephen Sill II