1 files changed, 40 insertions, 19 deletions

diff --git a/app/assets/javascripts/due_date_select.js.es6 b/app/assets/javascripts/due_date_select.js.es6
index d81d4cf8425..ab5ce23d261 100644
--- a/app/assets/javascripts/due_date_select.js.es6
+++ b/app/assets/javascripts/due_date_select.js.es6
@@ -1,4 +1,6 @@
 /* eslint-disable wrap-iife, func-names, space-before-function-paren, comma-dangle, prefer-template, consistent-return, class-methods-use-this, arrow-body-style, no-unused-vars, no-underscore-dangle, no-new, max-len, no-sequences, no-unused-expressions, no-param-reassign */
+/* global dateFormat */
+/* global Pikaday */
 
 (function(global) {
   class DueDateSelect {
@@ -25,11 +27,14 @@
       this.initGlDropdown();
       this.initRemoveDueDate();
       this.initDatePicker();
-      this.initStopPropagation();
     }
 
     initGlDropdown() {
       this.$dropdown.glDropdown({
+        opened: () => {
+          const calendar = this.$datePicker.data('pikaday');
+          calendar.show();
+        },
         hidden: () => {
           this.$selectbox.hide();
           this.$value.css('display', '');
@@ -38,25 +43,37 @@
     }
 
     initDatePicker() {
-      this.$datePicker.datepicker({
-        dateFormat: 'yy-mm-dd',
-        defaultDate: $("input[name='" + this.fieldName + "']").val(),
-        altField: "input[name='" + this.fieldName + "']",
-        onSelect: () => {
+      const $dueDateInput = $(`input[name='${this.fieldName}']`);
+
+      const calendar = new Pikaday({
+        field: $dueDateInput.get(0),
+        theme: 'gitlab-theme',
+        format: 'YYYY-MM-DD',
+        onSelect: (dateText) => {
+          const formattedDate = dateFormat(new Date(dateText), 'yyyy-mm-dd');
+
+          $dueDateInput.val(formattedDate);
+
           if (this.$dropdown.hasClass('js-issue-boards-due-date')) {
-            gl.issueBoards.BoardsStore.detail.issue.dueDate = $(`input[name='${this.fieldName}']`).val();
+            gl.issueBoards.BoardsStore.detail.issue.dueDate = $dueDateInput.val();
             this.updateIssueBoardIssue();
           } else {
-            return this.saveDueDate(true);
+            this.saveDueDate(true);
           }
         }
       });
+
+      this.$datePicker.append(calendar.el);
+      this.$datePicker.data('pikaday', calendar);
     }
 
     initRemoveDueDate() {
       this.$block.on('click', '.js-remove-due-date', (e) => {
+        const calendar = this.$datePicker.data('pikaday');
         e.preventDefault();
 
+        calendar.setDate(null);
+
         if (this.$dropdown.hasClass('js-issue-boards-due-date')) {
           gl.issueBoards.BoardsStore.detail.issue.dueDate = '';
           this.updateIssueBoardIssue();
@@ -67,12 +84,6 @@
       });
     }
 
-    initStopPropagation() {
-      $(document).off('click', '.ui-datepicker-header a').on('click', '.ui-datepicker-header a', (e) => {
-        return e.stopImmediatePropagation();
-      });
-    }
-
     saveDueDate(isDropdown) {
       this.parseSelectedDate();
       this.prepSelectedDate();
@@ -86,7 +97,7 @@
         // Construct Date object manually to avoid buggy dateString support within Date constructor
         const dateArray = this.rawSelectedDate.split('-').map(v => parseInt(v, 10));
         const dateObj = new Date(dateArray[0], dateArray[1] - 1, dateArray[2]);
-        this.displayedDate = $.datepicker.formatDate('M d, yy', dateObj);
+        this.displayedDate = dateFormat(dateObj, 'mmm d, yyyy');
       } else {
         this.displayedDate = 'No due date';
       }
@@ -153,14 +164,24 @@
     }
 
     initMilestoneDatePicker() {
-      $('.datepicker').datepicker({
-        dateFormat: 'yy-mm-dd'
+      $('.datepicker').each(function() {
+        const $datePicker = $(this);
+        const calendar = new Pikaday({
+          field: $datePicker.get(0),
+          theme: 'gitlab-theme',
+          format: 'YYYY-MM-DD',
+          onSelect(dateText) {
+            $datePicker.val(dateFormat(new Date(dateText), 'yyyy-mm-dd'));
+          }
+        });
+
+        $datePicker.data('pikaday', calendar);
       });
 
       $('.js-clear-due-date,.js-clear-start-date').on('click', (e) => {
         e.preventDefault();
-        const datepicker = $(e.target).siblings('.datepicker');
-        $.datepicker._clearDate(datepicker);
+        const calendar = $(e.target).siblings('.datepicker').data('pikaday');
+        calendar.setDate(null);
       });
     }