It's possible for the calendar popup to change multiple date elements.

There is no real way to test this because the behaviour of the pop-up has changed. Previously when you had multiple date elements enabled on a form, and clicked on a calendar image so the pop-up appeared you could then click on another element's calendar image and the first element's pop-up would disappear but another would not appear until you clicked the image again. Meaning you had to click twice for the date pop-up to appear for the second date element you selected. Now, when you click on any calendar image, any previously opened date selectors for other elements that were open will be closed and a new pop-up will appear. Test 1 Go to Site administration ► Users ► Accounts ► Browse list of users. Click "Show more" Enable all the date fields. Change the dates and ensure the date only changes for the one you selected. Alternate between changing dates in the pop-up and the select boxes. Test 2 Create a feedback activity. On the settings page enable all date fields. Change the dates and ensure the date only changes for the one you selected. Alternate between changing dates in the pop-up and the select boxes. Test 3 Repeat the steps in MDL-26649 Please test in at least ie, firefox and chrome.