[BUG] Error handling timezones

[Jmbols]

Description
There is an error trying to construct an update patch when the x-axis are dates with a specified timezone.
The error is when trying to compare timezones. Pandas pd.to_datetime() by default will convert a timezone to a fixed off-set, whereas the timezone in the x-axis has a different format. The off-set is the same because the data is created based on the same timezone.

/.pyenv/versions/3.11.1/envs/clearview-dash-311/lib/python3.11/site-packages/plotly_resampler/aggregation/plotly_aggregator_parser.py", line 41, in to_same_tz
assert ts.tz.str() == reference_tz.str()
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

Reproducing the bug 🔍
This code snippet reproduces the bug

import pandas as pd
import numpy as np
import plotly.graph_objects as go

from plotly_resampler import FigureResampler


fig = FigureResampler()

x = pd.date_range("2024-04-01T00:00:00", "2025-01-01T00:00:00", freq="H")
x = x.tz_localize("Asia/Taipei")
y = np.random.randn(len(x))

fig.add_trace(
    go.Scattergl(x=x, y=y, name="demo", mode="lines+markers"),
    max_n_samples=int(len(x) * 0.2),
)

relayout_data = {
    "xaxis.range[0]": "2024-04-27T08:00:00+08:00",
    "xaxis.range[1]": "2024-05-04T17:15:39.491031+08:00",
}

fig.construct_update_data_patch(relayout_data)

Environment information

• OS: Ubuntu 22.04
• Python version: 3.11
• plotly-resampler environment: python and dash
• plotly-resampler version: 0.9.2

[Jmbols]

Can be fixed by tz_convert before passing relayout_data to fig.construct_update_data_patch(relayout_data), but the default behaviour interacting with dash is this error.

[Jmbols]

But fix only works when there is no switch to DST. Timezone Canada/Pacific, for example, changes timezone upon switch to and from DST, so if the above code is run like

import pandas as pd
import numpy as np
import plotly.graph_objects as go

from plotly_resampler import FigureResampler


fig = FigureResampler()

x = pd.date_range("2024-04-01T00:00:00", "2025-01-01T00:00:00", freq="H")
x = x.tz_localize("UTC")
x = x.tz_convert("Canada/Pacific")
y = np.random.randn(len(x))

fig.add_trace(
    go.Scattergl(x=x, y=y, name="demo", mode="lines+markers"),
    max_n_samples=int(len(x) * 0.2),
)

relayout_data = {
    "xaxis.range[0]": pd.Timestamp("2024-03-01T00:00:00").tz_localize("Canada/Pacific"),
    "xaxis.range[1]": pd.Timestamp("2024-03-31T00:00:00").tz_localize("Canada/Pacific"),
}

fig.construct_update_data_patch(relayout_data)

you get the error:
site-packages/plotly_resampler/aggregation/plotly_aggregator_parser.py", line 81, in get_start_end_indices
assert start.tz == end.tz
^^^^^^^^^^^^^^^^^^

Is there a reason not to use assert start.tz.__str__() == end.tz.__str__()? That would solve the assertion error at least with DST if the name of the timezone is the same.