[Fix] Session Duration trajectory timezone(UTC) & Today filter order v2

[bezhanSalleh]

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[what-the-diff]

PR Summary

• Modified Timestamp Conversion Method
  The way the software handles time stamps has been improved. Specifically, we now use a method called 'createFromTimestampUTC' which better accounts for different time zones and ensures more accurate time keeping.

• Altered Assignment Order in Session Duration Calculation
  There has been a slight reorganization in how session duration is computed. This should not affect the end result, but simplifies the underlying process, making future maintenance easier. The order of 'previous' and 'result' data points in the calculations has been changed in a way that would enhance efficiency.