One possible workaround to do this in JIRA Cloud:
Information on the Update Issue Custom Field post-function is here, which is where I found to use %%CURRENT_DATETIME%% to set current date. Not sure how flexible it will be regarding setting fixed dates or doing calculations. Probably needs a bit of experimentation to see what is possible: https://jsutil.atlassian.net/wiki/display/JSUTIL/JIRA+Suite+Utilities+Workflow+Post-Functions#JIRASuiteUtilitiesWorkflowPost-Functions-UpdateIssueCustomFieldPost-Function
Hope this is useful.
I have multiple projects that use variations of the same base workflow. The variations depend on the requirements of the project or issue type. The variations mostly come in the form of new statuses ...
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