This is the documentation of JSU for Jira Server/Data Center. If you are using JSU on Jira Cloud, you can find the documentation here.
The 'Date Expression Compare' check compares the value of a date field with a date expression (for example, date field must be more recent than actual date). If the check fails, no action will be performed. You must select the date field, the comparison condition, the date expression itself, and optional whether to include the time part for comparison. For example: You can define a custom error message for most JSU validators to provide a clear explanation of the situation to your users. If you leave this field empty, a default error message from Jira will be displayed on validation errors. This might be a bit too technical, and make it difficult for your users to understand and resolve the error. A workflow is configured so that the 'Resolve' transition has the 'Date Expression Compare' check where 'Due Date' > '5d'. If a user attempts to resolve an issue on this workflow, where the 'Due Date' is less than 5 days from now, the check will fail and no action will be performed. JSU supports many different field types such as system fields and custom fields. However you should be aware, that not all field types are supported, and not in all combinations. We aim to cover the most important field types and are continuously adding and improving how different field types are supported. Some custom fields of other third-party apps might never be supported. You should always test anything you do with issue fields with JSU. You can try it with a free 30-day evaluation license.Description
Configuration
For information on how to configure a check in JIRA, see the JIRA documentation.Example
Supported Field Types