The look and feel of the system is preserved. This reduces risk. Testing can be targeted, reducing testing cost. Testing is as for incremental maintenance. Existing test data and archive data remains unexpanded.
Configuration management is simplified.
Project is smaller. Arguments Against the Procedural Approach Date logic may be complex due to the need in some processing to cater for century rollover explicitly. Ongoing maintenance is more expensive. As more and more interfacing systems carry 4 digit years, bridging requirements will increase. Procedural logic for century rollover may have greater processing impact than extending the data items.