[🐛 BUG] Timezone problem on initialization

[enarroied]

What went wrong? 🤔

I have a question about how Taipy manages date and time. I see that Gui().run has timezone parameter, that defaults to client.

When I instantiate a variable with datetime.datetime.now(), I think this uses the server's local datetime.

What I observe by playing around with it, is that when a date is modified from a date visual element, that date is stored in GMT, but is displayed, in the date element, in the selected timezone.

I see 2 potential problems:
1- The timezone that I use to initialize the values is not GMT (unless the server is in a GMT zone). So this can lead to inconsistencies.
2- If I display the date in a text() element, I get the GMT date, but the date element shows the timezone I selected within run().

Date and time is always a painful thing, so I don't know if this is a bug, or if I'm being too maniac. This is not a technical bug, it would be a malfunction at most.

Expected Behavior

Time zones should be consistent acoss visual elements, and across time.
If Taipy uses GMT datetimes, values should always e in GMT, even if they are initialized before the run() (I think that is one of the problems, but I'm not 100% sure).

Steps to Reproduce Issue

This code helps to reproduce the issue, but you need to interact to data element to see it better:

import datetime as dt

import taipy.gui.builder as tgb
from taipy import Gui

with tgb.Page() as page:
    tgb.text("# Date and times", mode="md")

    tgb.text("{str(just_a_date)}")
    tgb.date("{just_a_date}", with_time=True)


if __name__ == "__main__":
    just_a_date = dt.datetime.now()
    print(f"Now it's: {just_a_date}")

    gui = Gui(page=page)
    gui.run(
        # time_zone="Indian/Maldives", # for example - a different timezone for me
    )

Runtime Environment

Windows 10, I used Python 12 within Anaconda, Taipy develop

Browsers

Brave

OS

Windows

Version of Taipy

4.0.0

Acceptance Criteria

• A unit test reproducing the bug is added.
• Any new code is covered by a unit tested.
• Check code coverage is at least 90%.
• The bug reporter validated the fix.
• Related issue(s) in taipy-doc are created for documentation and Release Notes are updated.

Code of Conduct

• I have checked the existing issues.
• I am willing to work on this issue (optional)