Incorrect Time Handling on DST Transition Days

[glebamichal]

Hello,

I've encountered a problem with the reactive date time picker package related to Daylight Saving Time (DST) adjustments. Specifically, when selecting a time on the days when DST changes (e.g., the start in March and the end in October), the time saved by the picker is automatically adjusted by one hour, which is incorrect for my use case.

Issue Description
Date and Time Selection: When I select a time on 30 March 2024, which is the DST start date for many regions (the clocks go forward), and choose 15:00, the time that gets saved and displayed in the application is 16:00. This automatic adjustment makes it impossible to save the correct time through the picker for this particular day.
Autumn Adjustment: A similar issue occurs on the DST end date in October, but in reverse; selecting a time results in the saved time being an hour earlier than what was selected.

Impact
This behavior disrupts functionality for any application feature relying on accurate time selection by users, especially for events or appointments scheduled on DST transition days.

Request for Solution or Advice
I am looking for a way to address or work around this issue. Ideally, the picker would not auto-adjust the selected time based on DST changes, or there would be a configuration option to disable this behaviour.

Your guidance on how to handle or fix this issue would be greatly appreciated.

Thank you for your support.

[vasilich6107]

Hi.
Does flutter native components have same behavior?
I do not apply any manual time adjustments in widget code.

[vasilich6107]

Hi @glebamichal
I've updated the internals of combine function, this should help to deal with DST transions
Could you check if reactive_date_time_picker 4.0.0 works for you.

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