Too Many arguments have been given to this function

I am trying to get the number of days a work order has been opened.  I am using the simple formula below and getting the message:

Too Many arguments have been given to this function

Below is the formula and other information.

{DateOpened} = formula name.

//cdate(cstr({CGIBASE.CB_DTA}, "####,##,##"))

cstr({CGIDR.DRDATE}, "####,##,##")

The one that is commented out works however when using the other field I get the message.

DRDATE: String(8)

CB_DTA:Number

I am not sure what to do with the CGIDR.DRDATE field so I can use it in the formula below.

today - ({@DateOpened})