Merge branch 'fix-timezone-due-date-picker' into 'master'

app/assets/javascripts/due_date_select.js.es6

@@ -80,9 +80,12 @@
     }
 
     parseSelectedDate() {
-      this.rawSelectedDate = $("input[name='" + this.fieldName + "']").val();
+      this.rawSelectedDate = $(`input[name='${this.fieldName}']`).val();
+
       if (this.rawSelectedDate.length) {
-        let dateObj = new Date(this.rawSelectedDate);
+        // 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);
       } else {
         this.displayedDate = 'No due date';

app/views/shared/issuable/_sidebar.html.haml

@@ -97,7 +97,7 @@
                   remove due date
           - if can?(current_user, :"admin_#{issuable.to_ability_name}", @project)
             .selectbox.hide-collapsed
-              = f.hidden_field :due_date, value: issuable.due_date
+              = f.hidden_field :due_date, value: issuable.due_date.try(:strftime, 'yy-mm-dd')
               .dropdown
                 %button.dropdown-menu-toggle.js-due-date-select{ type: 'button', data: { toggle: 'dropdown', field_name: "#{issuable.to_ability_name}[due_date]", ability_name: issuable.to_ability_name, issue_update: issuable_json_path(issuable) } }
                   %span.dropdown-toggle-text Due date

changelogs/unreleased/fix-timezone-due-date-picker.yml

+---
+title: Fix date inconsistency on due date picker
+merge_request: 7422
+author: Giuliano Varriale

spec/features/issues_spec.rb

@@ -619,14 +619,18 @@ describe 'Issues', feature: true do
       end
 
       it 'adds due date to issue' do
+        date = Date.today.at_beginning_of_month + 2.days
+
         page.within '.due_date' do
           click_link 'Edit'
 
           page.within '.ui-datepicker-calendar' do
-            first('.ui-state-default').click
+            click_link date.day
           end
 
-          expect(page).to have_no_content 'None'
+          wait_for_ajax
+
+          expect(find('.value').text).to have_content date.strftime('%b %-d, %Y')
         end
       end
 
@@ -638,6 +642,8 @@ describe 'Issues', feature: true do
             first('.ui-state-default').click
           end
 
+          wait_for_ajax
+
           expect(page).to have_no_content 'No due date'
 
           click_link 'remove due date'