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pylab_examples example code: date_demo_rrule.pyΒΆ

(Source code, png, pdf)

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

See for help with rrules
import matplotlib.pyplot as plt
from matplotlib.dates import YEARLY, DateFormatter, rrulewrapper, RRuleLocator, drange
import numpy as np
import datetime

# tick every 5th easter
rule = rrulewrapper(YEARLY, byeaster=1, interval=5)
loc = RRuleLocator(rule)
formatter = DateFormatter('%m/%d/%y')
date1 =, 1, 1)
date2 =, 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)
labels = ax.get_xticklabels()
plt.setp(labels, rotation=30, fontsize=10)

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