| """ | |
| ================= | |
| Date Demo Convert | |
| ================= | |
| """ | |
| import datetime | |
| import matplotlib.pyplot as plt | |
| import numpy as np | |
| from matplotlib.dates import DateFormatter, DayLocator, HourLocator, drange | |
| date1 = datetime.datetime(2000, 3, 2) | |
| date2 = datetime.datetime(2000, 3, 6) | |
| delta = datetime.timedelta(hours=6) | |
| dates = drange(date1, date2, delta) | |
| y = np.arange(len(dates)) | |
| fig, ax = plt.subplots() | |
| ax.plot(dates, y**2, 'o') | |
| # this is superfluous, since the autoscaler should get it right, but | |
| # use date2num and num2date 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(range(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() | |
| plt.show() | |