[Matplotlib-users] datestr2num, dateutil.parse and timezone problems

[Charles S. <cs...@st...>]

I am having some problems getting matplotlib.dates.datestr2num to handle
timezones in the datestring.

>import matplotlib
>matplotlib.dates.datestr2num('Jan 1, 2007 12:00 PDT')
732677.83333333337
>matplotlib.dates.datestr2num('Jan 1, 2007 12:00 PST')
732677.83333333337
>matplotlib.dates.datestr2num('Jan 1, 2007 12:00-08')
732677.83333333337
>matplotlib.dates.datestr2num('Jan 1, 2007 12:00 UTC')
732677.5
>matplotlib.dates.datestr2num('Jan 1, 2007 12:00 EST')
732677.5
>matplotlib.dates.datestr2num('Jan 1, 2007 12:00-07')
732677.79166666663

The problem appears to lie with dateutil, as direct use of the
dateutil.parser.parse function shows the same problem:

> import dateutil.parser
> dateutil.parser.parse('Jan 1, 2007 12:00 EST')
datetime.datetime(2007, 1, 1, 12, 0)
> dateutil.parser.parse('Jan 1, 2007 12:00 PDT')
datetime.datetime(2007, 1, 1, 12, 0, tzinfo=tzlocal())
> dateutil.parser.parse('Jan 1, 2007 12:00 PST')
datetime.datetime(2007, 1, 1, 12, 0, tzinfo=tzlocal())

I am using dateutil version 1.2.

Any suggestions on how to get either matplotlib.dates.datestr2num or
dateutil.parser.parse to properly handle timezone information in the
datestring would be greatly appreciated.

Charles Seaton
OHSU/CMOP
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