I have a custom attribute that is a Date/Time field:

I am trying to pre-populate the current Date/Time in this field when a new record is created. I am familiar with the process enrichment BPA flow, and I have identified the correct projection to tie into.
I am also inserting the current user that triggers the BPA in a different field, so i know my flow is working correctly. However, when I try to insert the current date/time, i receive an error.
This is my flow:

The code in my “Get Current DateTime” node:
var currentDate = new Date();
execution.setVariable("Cf_Pcx_Datetime", currentDate);
When triggered, I receive this error:

I have also tried the following code and received the same error:
var currentDate = new Date();
var isoDate = currentDate.toISOString();
execution.setVariable("Cf_Pcx_Datetime", isoDate );
I have also tried to hardcode an ISO string and supply that variable, same error.
For reference, I am on 24R2.5. What am I missing? Thanks in advance!