I am trying to do some transforms within a Redshift Data Flow where I need the year and month from a date field in the form of YYYYMM so I can do some math with it. I thought I could use the extract(year_month from date) function, but I get the following error:

The database reported a syntax error. [Amazon](500310) Invalid operation: Invalid date part for DATEPART/EXTRACT: Details:<br>----------------------------------------------- error: Invalid date part for DATEPART/EXTRACT:<br> code: 8001 context: Invalid date part:year_month. query

Here's an example: 

SELECT extract(year_month from CURRENT_DATE);

What is the proper syntax for this?