The Date Selector is updated with new design theme styles.
During migration, the Date Selector HTML file is replaced in your application with new Date Selector HTML file. Customizations you have made to this HTML file will be lost. Also the Date Selector ASPX and code-behind files are rebuilt.
After migration, re-apply any customizations you may have made to the original Date Selector files to the new Date Selector files in your application.
Version 5.0 Application Migration