Bad date-time format string error

[luvtitans50]

I have the below formula and it is returning the above error. Please help me with this issue:

If isnull({Command.weekending}) then "NULL"
else ToText({Command.weekending},","mmddyyyy")

 

[lbass]

If isnull({Command.weekending}) then
"NULL" else
ToText({Command.weekending},"MMddyyyy")

I removed the extra " and changed the case for the month format.

-LB

 

[luvtitans50]

Thanks!