Can’t calculate field to <NULL> using None

[Jim_Riedmann]

I’m using ArcGIS Pro 3.3.1.  I have an attribute table with a date field.  I want to replace some of the values in the field with <NULL>.  Using the field calculator, with the Expression Type set to Python, I type None in the space for the new field value.  I get Warning 003571 and the value in the table stays the same.  I can’t find any way to get <NULL> into the date field.   I looked at the Fields view and NULL is allowed for that field.

[Eugene_Adkins · Accepted solution]

Using Field Calculator/Arcade, type "return null" and if the fields are nullable this should work.

[Jim_Riedmann]

That method works, thanks very much.

[KenBuja]

Even though you do get that warning, the date values are calculated to null.

 

[Bud]

Related idea: Warning 003571 is not needed when using field calculator to set value to None

[Jim_Riedmann]

No, they are not calculated to NULL.  They remain unchanged.

[KenBuja]

That's curious, since it worked in my testing. I created a new date field, copied an existing field's dates into the records, then set them to null again. The screen image was the last step in my process.