set currentDate cookie on index page load

src/main/resources/templates/index.ftl

@@ -71,5 +71,6 @@
         <#import "scripts.ftl" as scripts>
         <@scripts.scripts/>
         <script src="/js/datePicker.js"></script>
+        <script>document.cookie = "currentDate=${helpers.getDateString(currentDate)}";</script>
     </body>
 </html>
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