dates

import matplotlib as mpl
import matplotlib.pyplot as plt
import numpy as np
import datetime as dt
fig = plt.figure()
ax2 = fig.add_subplot(212)
date2_1 = dt.datetime(2008, 9, 23)
date2_2 = dt.datetime(2008, 10, 3)
delta2 = dt.timedelta(days=1)
dates2 = mpl.dates.drange(date2_1, date2_2, delta2)
y2 = np.random.rand(len(dates2))
ax2.plot_date(dates2, y2, linestyle='-');
dateFmt = mpl.dates.DateFormatter('%Y-%m-%d')
ax2.xaxis.set_major_formatter(dateFmt)
daysLoc = mpl.dates.DayLocator()
hoursLoc = mpl.dates.HourLocator(interval=6)
ax2.xaxis.set_major_locator(daysLoc)
ax2.xaxis.set_minor_locator(hoursLoc)
fig.autofmt_xdate(bottom=0.18) # adjust for date labels display
fig.subplots_adjust(left=0.18)
ax1 = fig.add_subplot(211)
date1_1 = dt.datetime(2008, 9, 23)
date1_2 = dt.datetime(2009, 2, 16)
delta1 = dt.timedelta(days=10)
dates1 = mpl.dates.drange(date1_1, date1_2, delta1)
y1 = np.random.rand(len(dates1))
ax1.plot_date(dates1, y1, linestyle='-');
monthsLoc = mpl.dates.MonthLocator()
weeksLoc = mpl.dates.WeekdayLocator()
ax1.xaxis.set_major_locator(monthsLoc)
ax1.xaxis.set_minor_locator(weeksLoc)
monthsFmt = mpl.dates.DateFormatter('%b')
ax1.xaxis.set_major_formatter(monthsFmt)
plt.show()