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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Unevenly spaced ticks in plot_date()","articleBody":"### Bug report\r\n\r\nWhen plotting with `plot_date()`, the x axis ticks can be unevenly spaced. It looks like when the tick spacing is less than a month, the start of the month is always present as a tick, which may mean the space between it and the previous tick is small. This can lead to overlapping tick labels and generally poor looking axes and grids.\r\n\r\n**Code for reproduction**\r\n\r\n```python\r\nimport numpy as np\r\nimport matplotlib.pyplot as plt\r\n\r\nstart = np.datetime64('2018-01-01', 'D')\r\nend = np.datetime64('2018-04-01', 'D')\r\ndates = np.arange(start, end)\r\ndata = np.random.randn(len(dates))\r\n\r\nplt.plot_date(dates, data)\r\nplt.grid(True)\r\nplt.gcf().autofmt_xdate()\r\nplt.show()\r\n```\r\n\r\n**Actual outcome**\r\n\r\n\u003c!--The output produced by the above code, which may be a screenshot, console output, etc.--\u003e\r\n![image](https://user-images.githubusercontent.com/1044087/51126029-11384100-17f0-11e9-8341-28790dc7d8e5.png)\r\n\r\n**Expected outcome**\r\n\r\nThe plot should have evenly spaced gridlines and axis ticks, unless a custom locator has specified otherwise.\r\n\r\n**Matplotlib version**\r\n\u003c!--Please specify your platform and versions of the relevant libraries you are using:--\u003e\r\n  * Operating system: Arch Linux\r\n  * Matplotlib version: 3.0.2\r\n  * Matplotlib backend (`print(matplotlib.get_backend())`): Qt5Agg\r\n  * Python version: 3.7.2\r\n  * Jupyter version (if applicable): n/a\r\n  * Other libraries: matplotlib 1.15.4\r\n\r\nMatplotlib, Python and numpy are installed with the OS package manager using the standard Arch Linux repositories.","author":{"url":"https://github.com/chrisjbillington","@type":"Person","name":"chrisjbillington"},"datePublished":"2019-01-14T16:38:52.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":7},"url":"https://github.com/13183/matplotlib/issues/13183"}