DOJO Script for updating the Current Month Enum attribute when State Transitioned.

This is in continuation with my previous question for the same clarification. This is when the Status is manually changed from B to C. the Quarter and Year and automatically getting updated by the existing plugin. Updating the plugin is having an issue, so looking for a DOJO Script for updating the Current Month Enum attribute when State Transitioned which can be used as part of the "Attribute Customization"
Status | A → B |
Actual Value :"Jan"
Status | B → C |
Month | Check for the "Current Month" and update the appropriate Enum value |