Shipping Date
Each tracking entry can store a Shipping Date.
When adding tracking
The new tracking row starts with the current date. You can change it before saving the order.
Storage format
The tracking record stores the date in YYYY-MM-DD format.
Customer display
Customer-facing tracking output formats the date using the WooCommerce/WordPress store date format.
CSV
The CSV import expects YYYY-MM-DD. The CSV export uses the stored value.