Update DateTime class and to_pydatetime function to preserve time…

…zone information

* Update `DateTime` class to preserve timezone information when converting Python `datetime` objects to C# `System.DateTime` objects
* Update `to_pydatetime` function to handle different date formats and retain timezone information when converting C# `System.DateTime` objects to Python `datetime` objects
* Add `test_quote_constructor_handles_various_date_formats` method to verify that the `Quote` class can handle various date formats

stock_indicators/_cstypes/datetime.py

@@ -20,8 +20,6 @@ class DateTime:
         3/26/2021 10:02:22 PM
     """
     def __new__(cls, datetime: PyDateTime) -> CsDateTime:
-        if datetime.tzinfo is not None:
-            datetime = datetime.astimezone(PyTimezone.utc)
         return CsDateTime.Parse(datetime.isoformat(timespec='seconds'))
 
 
@@ -33,8 +31,6 @@ def to_pydatetime(cs_datetime: CsDateTime) -> PyDateTime:
         cs_datetime : `System.DateTime` of C#.
     """
     py_datetime = PyDateTime.fromisoformat(cs_datetime.ToString("o", CsCultureInfo.InvariantCulture))
-    if py_datetime.tzinfo is not None:
-        py_datetime = py_datetime.astimezone(py_datetime.tzinfo)
     return py_datetime
 
 if not hasattr(PyDateTime, 'timezone'):

stock_indicators/indicators/common/quote.py

@@ -15,8 +15,6 @@ def _get_date(quote):
     return to_pydatetime(quote.Date)
 
 def _set_date(quote, value):
-    if value.tzinfo is not None:
-        value = value.astimezone(timezone.utc)
     quote.Date = CsDateTime(value)
 
 def _get_open(quote):