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.
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