René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"DayLocator is returning incorrect times around daylights switch over","articleBody":"### Bug report\r\n\r\n**Bug summary**\r\n\r\n`DayLocator` returning incorrect times around daylights switch over, resulting in duplicate day labels.\r\n\r\n**Code for reproduction**\r\n\r\n```python\r\nimport datetime\r\n\r\nimport pylab\r\nimport matplotlib.dates as mdates\r\nimport pytz\r\n\r\nx = [datetime.datetime(2017, 3, 30), datetime.datetime(2017,4,4)]\r\ny = [0, 1]\r\n\r\npylab.plot(x, y)\r\n\r\nax = pylab.gca()\r\n\r\ntz = pytz.timezone(\"Australia/Sydney\")\r\nax.xaxis.set_major_locator(mdates.DayLocator(tz=tz))\r\nax.xaxis.set_major_formatter(mdates.DateFormatter(\"%a\", tz=tz))\r\n\r\npylab.show()\r\n```\r\n\r\n**Actual outcome**\r\nThe day labels for the day of the daylight switch over are duplicated, see figure below:\r\n\r\n![image](https://user-images.githubusercontent.com/6415805/29203748-4c12a116-7e73-11e7-8671-e80f78a59050.png)\r\n\r\n**Expected outcome**\r\nThe labels should not be duplicated.\r\n\r\n**Matplotlib version**\r\n\r\n  * Operating System: Kubuntu 17.04\r\n  * Matplotlib Version: 2.02\r\n  * Python Version: Python 2.7.13 \r\n  * pytz: 2017.2\r\n","author":{"url":"https://github.com/LanceJenkinZA","@type":"Person","name":"LanceJenkinZA"},"datePublished":"2017-08-11T07:08:37.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":4},"url":"https://github.com/9018/matplotlib/issues/9018"}