Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > comp.lang.python > #93479

Re: Matplotlib X-axis timezone trouble

Show all headers | View raw

Peter Pearson <pkpearson@nowhere.invalid> writes:

> The following code produces a plot with a line running from (9:30, 0) to
> (10:30, 1), not from (8:30, 0) to (9:30, 1) as I desire.
>
> If I use timezone None instead of pacific, the plot is as desired, but
> of course that doesn't solve the general problem of which this is a
> much-reduced example.
>
> If I use timezone US/Central, I get the same (bad) plot.
>
> import matplotlib.pyplot as plt
> import datetime
> import pytz
> pacific = pytz.timezone("US/Pacific")
> fig = plt.figure()
> plt.plot([datetime.datetime(2014, 10, 7, 8, 30, tzinfo=pacific),
>           datetime.datetime(2014, 10, 7, 9, 30, tzinfo=pacific)],
>          [0,1], marker="o", color="green")
> fig.autofmt_xdate()
> plt.show()
>
> Does anybody know why this shift is occurring?  Is Matplotlib
> confused about what timezone to use in labeling the axis?  How
> would I tell it what timezone to use (preferably explicitly in
> the code, not in matplotlibrc)?
>

Your pytz usage is incorrect.

Don't pass a pytz tzinfo object to the datetime construtor directly, use
`.localize()` method instead. Read the note at the very beginning of
pytz docs http://pytz.sourceforge.net/

Back to comp.lang.python | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

Matplotlib X-axis timezone trouble Peter Pearson <pkpearson@nowhere.invalid> - 2015-06-30 00:56 +0000
  Re: Matplotlib X-axis timezone trouble Laura Creighton <lac@openend.se> - 2015-06-30 04:03 +0200
    Re: Matplotlib X-axis timezone trouble Peter Pearson <pkpearson@nowhere.invalid> - 2015-06-30 04:57 +0000
  Re: Matplotlib X-axis timezone trouble Chris Angelico <rosuav@gmail.com> - 2015-06-30 12:11 +1000
    Re: Matplotlib X-axis timezone trouble Peter Pearson <pkpearson@nowhere.invalid> - 2015-06-30 04:49 +0000
      Re: Matplotlib X-axis timezone trouble Chris Angelico <rosuav@gmail.com> - 2015-06-30 17:01 +1000
        Re: Matplotlib X-axis timezone trouble Peter Pearson <pkpearson@nowhere.invalid> - 2015-06-30 16:42 +0000
          Re: Matplotlib X-axis timezone trouble Chris Angelico <rosuav@gmail.com> - 2015-07-01 02:55 +1000
  Re: Matplotlib X-axis timezone trouble Peter Pearson <pkpearson@nowhere.invalid> - 2015-07-01 05:50 +0000
    Re: Matplotlib X-axis timezone trouble Chris Angelico <rosuav@gmail.com> - 2015-07-01 17:15 +1000
      Datetime timezone trouble (was: Matplotlib X-axis timezone trouble) Peter Pearson <pkpearson@nowhere.invalid> - 2015-07-01 16:36 +0000
        Re: Datetime timezone trouble (was: Matplotlib X-axis timezone trouble) Ian Kelly <ian.g.kelly@gmail.com> - 2015-07-01 10:55 -0600
          Re: Datetime timezone trouble (was: Matplotlib X-axis timezone trouble) Peter Pearson <pkpearson@nowhere.invalid> - 2015-07-01 19:09 +0000
        Re: Datetime timezone trouble (was: Matplotlib X-axis timezone trouble) Chris Angelico <rosuav@gmail.com> - 2015-07-02 03:08 +1000
  Re: Matplotlib X-axis timezone trouble Akira Li <4kir4.1i@gmail.com> - 2015-07-04 07:29 +0300
    Re: Matplotlib X-axis timezone trouble [SOLVED] Peter Pearson <pkpearson@nowhere.invalid> - 2015-07-04 17:37 +0000
  Re: Matplotlib X-axis timezone trouble Tony the Tiger <tony@tiger.invalid> - 2015-07-09 19:50 +0000
    Re: Matplotlib X-axis timezone trouble Peter Pearson <pkpearson@nowhere.invalid> - 2015-07-10 16:15 +0000

csiph-web