Plot prices with time in the x axis

plot-price-time.py

from numpy import *
from matplotlib.pylab import *
import matplotlib.dates as mdates

data = loadtxt('quotes.csv', delimiter=',')

# Epoch time to number (matlab and matplotlib format)
TIMEZONE_CORRECTION = 60.0 * 60 * 5
time = mdates.epoch2num(data[:, 0] / 1000.0 - TIMEZONE_CORRECTION)
bid  = data[:, 1]
ask  = data[:, 2]

hours = mdates.HourLocator()
hours_fmt = mdates.DateFormatter("%H:%M")

fig = figure(figsize=(12, 8))
ax = fig.add_subplot(1, 1, 1)

ax.plot(time, bid, 'b', time, ask, 'r')

ax.xaxis.set_major_locator(hours)
ax.xaxis.set_major_formatter(hours_fmt)
xlim([min(time), max(time)])
grid(True, color='#babdb6', linestyle='-')

xlabel('time')
ylabel('price')
title('AAPL Quotes 2010-05-21')