matplotlib/examples/date_demo_convert.py at transforms · gitj/matplotlib · GitHub

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#!/usr/bin/env python

import datetime

from matplotlib.pyplot import figure, show

from matplotlib.dates import DayLocator, HourLocator, DateFormatter, drange

from numpy import arange

date1 = datetime.datetime( 2000, 3, 2)

date2 = datetime.datetime( 2000, 3, 6)

delta = datetime.timedelta(hours=6)

dates = drange(date1, date2, delta)

y = arange( len(dates)*1.0)

fig = figure()

ax = fig.add_subplot(111)

ax.plot_date(dates, y*y)

# this is superfluous, since the autoscaler should get it right, but

# use date2num and num2date to to convert between dates and floats if

# you want; both date2num and num2date convert an instance or sequence

ax.set_xlim( dates[0], dates[-1] )

# The hour locator takes the hour or sequence of hours you want to

# tick, not the base multiple

ax.xaxis.set_major_locator( DayLocator() )

ax.xaxis.set_minor_locator( HourLocator(arange(0,25,6)) )

ax.xaxis.set_major_formatter( DateFormatter('%Y-%m-%d') )

ax.fmt_xdata = DateFormatter('%Y-%m-%d %H:%M:%S')

fig.autofmt_xdate()

show()