factor out some duplicated code for handling 24 dates

www/admin/inner.js

@@ -1472,11 +1472,8 @@ define([
             var end = h('input');
             var $start = $(start);
             var $end = $(end);
-            var is24h = false;
+            var is24h = UIElements.is24h();
             var dateFormat = "Y-m-d H:i";
-            try {
-                is24h = !new Intl.DateTimeFormat(navigator.language, { hour: 'numeric' }).format(0).match(/AM/);
-            } catch (e) {}
             if (!is24h) { dateFormat = "Y-m-d h:i K"; }
 
             var endPickr = Flatpickr(end, {

www/common/common-ui-elements.js

@@ -3696,6 +3696,13 @@ define([
         return (pos.bottom < size) && (pos.y > 0);
     };
 
+    UIElements.is24h = function () {
+        try {
+            return !new Intl.DateTimeFormat(navigator.language, { hour: 'numeric' }).format(0).match(/AM/);
+        } catch (e) {}
+        return false;
+    };
+
     UIElements.openSnapshotsModal = function (common, load, make, remove) {
         var modal;
         var readOnly = common.getMetadataMgr().getPrivateData().readOnly;

www/form/inner.js

@@ -68,13 +68,9 @@ define([
     var APP = window.APP = {
     };
 
-    var is24h = false;
+    var is24h = UIElements.is24h();
     var dateFormat = "Y-m-d H:i";
     var timeFormat = "H:i";
-    try {
-        is24h = !new Intl.DateTimeFormat(navigator.language, { hour: 'numeric' }).format(0).match(/AM/);
-    } catch (e) {}
-    is24h = false;
     if (!is24h) {
         dateFormat = "Y-m-d h:i K";
         timeFormat = "h:i K";