Add support for timestamp timezones for chat message

[ahuang11]

Closes #5699

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (573497c) 84.65% compared to head (a77443d) 82.58%.

Files	Patch %	Lines
panel/chat/message.py	88.88%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5961      +/-   ##
==========================================
- Coverage   84.65%   82.58%   -2.07%     
==========================================
  Files         291      291              
  Lines       43458    43479      +21     
==========================================
- Hits        36788    35909     -879     
- Misses       6670     7570     +900     

Flag	Coverage Δ
ui-tests	38.36% <18.18%> (-2.47%)	⬇️
unitexamples-tests	72.23% <95.45%> (-0.50%)	⬇️

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[maximlt]

Does this implement the actual request to display the time in the browser timezone?

Probably the vast majority of users wants to see times in their browser timezone and this is confusing for them?

[philippjfr]

Indeed would be nice to automatically grab the timezone if pn.state.browser_info is defined.

[ahuang11]

Okay implemented zoneinfo + pn.state.browser_info.timezone

[DmitriyLeybel]

Using Jupyter notebooks with VS Code causes it to error out when using the ChatInterface layout due to pn.state.browser_info not being available.

import panel as pn
from panel.chat import ChatMessage, ChatInterface, ChatFeed

pn.extension()

def guided_get_num(contents, user, instance):
    if isinstance(contents, str):
        num = len(contents)
        instance.active = 1  # change to IntSlider tab
    else:
        num = contents
        instance.active = 0  # Change to TextAreaInput tab
    return f"Got {num}."

pn.chat.ChatInterface( 
    callback=guided_get_num,
    widgets=[
        pn.widgets.TextAreaInput(placeholder="Enter some text to get a count!"),
        pn.widgets.IntSlider(name="Number Input", end=10)
],
)

[ahuang11]

Thanks! Fix is in #6122 which I think can go into 1.3.7 release next week.