DAX calculated column to show # days open

[v-bgrov]

Hi,

I'm trying to calculate # of days open using a created date column and a closed date column.  However the closed date column is sometimes blank(because it is still open).

Here is my formula.  I'm getting an error "Too Many arguments were passed to the ISBLANK FUNCTION"

# DAYS OPEN= if(ISBLANK('List'[CLOSED Date],TODAY()-'List'[Created Date]),'List'[closed Date]-'List'[Created Date])

Thank you for your help.

[Anonymous · Accepted solution]

@v-bgrov, 

I believe this is just some syntax error, see the revised version below:

# DAYS OPEN =
IF (
    ISBLANK ( 'List'[CLOSED Date] ),
    TODAY () - 'List'[Open Date],
    'List'[closed Date] - 'List'[Open Date]
)

[v-bgrov]

thank you for your help.  The corrections you made worked great!