Today's date ignores local_timezone

My config has the following:

[locale]
default_timezone = America/Los_Angeles
local_timezone = America/Los_Angeles

My computer's timezone is set to UTC. It's displaying 2019-01-22 06:30:00 right now.

In Los Angeles, the time is currently 2019-01-21 22:30:00.

When I run khal, this is what I get:

$ khal
    Su Mo Tu We Th Fr Sa     Today, 2019-01-22
Jan 30 31  1  2  3  4  5     17:00-20:00 Meeting
     6  7  8  9 10 11 12     Tomorrow, 2019-01-23
    13 14 15 16 17 18 19     Thursday, 2019-01-24
    20 21 22 23 24 25 26     17:00-20:00 Meeting
Feb 27 28 29 30 31  1  2     Friday, 2019-01-25
     3  4  5  6  7  8  9     16:30-18:30 Meeting
    10 11 12 13 14 15 16     Saturday, 2019-01-26
    17 18 19 20 21 22 23     
Mar 24 25 26 27 28  1  2     
     3  4  5  6  7  8  9     
    10 11 12 13 14 15 16     
    17 18 19 20 21 22 23     
    24 25 26 27 28 29 30     
Apr 31  1  2  3  4  5  6

I expect Today, 2019-01-22 to be the 21st of January, not the 22nd of January.

The event times show up correctly, but they are truncated if their day is not shown.

$ khal calendar 2019-01-21
    Su Mo Tu We Th Fr Sa     Monday, 2019-01-21
Jan 30 31  1  2  3  4  5     23:00-24:00 Today!
     6  7  8  9 10 11 12     Today, 2019-01-22
    13 14 15 16 17 18 19     17:00-20:00 Meeting
    20 21 22 23 24 25 26     Tomorrow, 2019-01-23
Feb 27 28 29 30 31  1  2     Thursday, 2019-01-24
     3  4  5  6  7  8  9     17:00-20:00 Meeting
    10 11 12 13 14 15 16     Friday, 2019-01-25
    17 18 19 20 21 22 23     16:30-18:30 Meeting
Mar 24 25 26 27 28  1  2     
     3  4  5  6  7  8  9     
    10 11 12 13 14 15 16     
    17 18 19 20 21 22 23     
    24 25 26 27 28 29 30     
Apr 31  1  2  3  4  5  6

This happens for me both via pip install khal and from running master.

Is this something fixable from my configuration or is it worth me making a pull request for?

Start by reproducing the issue with the shown [locale] configuration and the khal command, using a UTC system timezone and America/Los_Angeles as local_timezone. Trace how khal determines the displayed Today date and event-day labels; done means Today reflects the configured local date and events are not incorrectly truncated.