Locales control the formats for dates, times, currencies, addresses, names, and numeric values. ICU sets the international standard for these formats. The ICU locale formats provide a consistent experience across the platform and improve integration with ICU-compliant applications across the globe. When you enable this update, the ICU locale formats replace Oracle’s Java Development Kit (JDK) locale formats in Salesforce
Salesforce Winter’25 Release Notes | Customization – Globalization
