Which action are you using? I was only able to get this to work when using Update Item, but not Update Multiple Items. I simply created a date variable in the workflow and then updated the item to that empty date variable.
I am using Update Item action only, I have tried your solution, but I am getting error and my workflow gets suspended for this particular action" Undefined variable" if my date variable value is empty.I am working on the Nintex workflow for office 365. Are you also working on the Nintex workflow for office 365?
I too have this issue on Nintex 365. There is no working example of this on Nintex O365. What is Nintex doing to fix this?
1) Have tried the various suggestions on creating a Null Variable.
2) Have also tried copying a Blank Date from a dedicated "Workflow Variable" list holding in it just a blank Date Value.
Can you clear a date column with a workflow in O365. All solutions seem to be for on premise
3) Tried the Convert Value action suggested here, also does not work in 365.
Empty date column with workflow
None of these work! How hard can it be to simply reset a Date to BLANK VALUE.
Apparently, VERY Hard, as the easy things are ALWAYS HARD!
Finally I got the solution for this issue.
I have used action "Office 365 update items" and then added date/time value blank and publish the workflow. It will reset your date field value null. Please let me know if you have any question.
I used the "Office 365 update items" action and my workflow gets suspended, can you please let me know the configuration steps to overcome this error.
Can you please share some screen shots of how you configured this action?