Using WEEKNUMBER() Formula

gsmith21

I'm trying to use the WEEKNUMBER() formula while calling a cell with a date in the format 07/17/19 and I keep getting an INVALID DATA TYPE error and I cannot figure out why.

This is the formula in the cell: 

=WEEKNUMBER([Install Start Date]1)

The [Install Start Date]1 displays 08/08/19 but is gathered from a VLOOKUP into another smartsheet. 

Works perfectly in Excel (with WEEKNUM) but not in Smartsheet.

Andrée Starå

Hi,

Is the Install Start Date a date column type? It has to be for the WEEKNUMBER function to work.

Hope that helps!

Have a fantastic day!

Best,

Andrée Starå

Workflow Consultant @ Get Done Consulting

gsmith21

The Install Start Date is restricted to dates only and it still does not work. The issue I'm having is that the date is populated by a VLOOKUP and is subject to change, so I can't copy and paste the column as strictly a date that isn't from a formula because it won't auto-update. Are there any work-arounds to get this to work?

Andrée Starå

I missed the VLOOKUP part. That's why it's not working. It's not added as a date from the link.

gsmith21

How do I get it to read into the WEEKNUMBER formula as a date? It now works for two of the cells but the rest of them with the same formula give me the same error as earlier. 

Andrée Starå

What's the difference between the cells?