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# Date Demo Rrule

Show how to use an rrule instance to make a custom date ticker - here we put a tick mark on every 5th easter

See https://moin.conectiva.com.br/DateUtil for help with rrules

    import matplotlib.pyplot as plt
    from matplotlib.dates import YEARLY, DateFormatter, rrulewrapper, RRuleLocator, drange
    import numpy as np
    import datetime

    # Fixing random state for reproducibility
    np.random.seed(19680801)

    # tick every 5th easter
    rule = rrulewrapper(YEARLY, byeaster=1, interval=5)
    loc = RRuleLocator(rule)
    formatter = DateFormatter('%m/%d/%y')
    date1 = datetime.date(1952, 1, 1)
    date2 = datetime.date(2004, 4, 12)
    delta = datetime.timedelta(days=100)

    dates = drange(date1, date2, delta)
    s = np.random.rand(len(dates))  # make up some random y values

    fig, ax = plt.subplots()
    plt.plot_date(dates, s)
    ax.xaxis.set_major_locator(loc)
    ax.xaxis.set_major_formatter(formatter)
    labels = ax.get_xticklabels()
    plt.setp(labels, rotation=30, fontsize=10)

    plt.show()

Total running time of the script: ( 0 minutes 0.066 seconds)

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