econdition(s) violated: slice::from_raw_parts_mut requires the pointer to be aligned and non-null, and the total size of the slice not to exceed `isize::MAX`

This indicates a bug in the program. This Undefined Behavior check is optional, and cannot be relied on for safety.BecauseFoldbeforeafterBecauseGapInTimeZonetzdatetime is ambiguous since it falls into a fold between offsets  and datetime is ambiguous since it falls into a gap between offsets error converting datetime to instant in time zone