timeZoneOffset property
The time zone offset, which is the difference between local time and UTC.
The offset is positive for time zones east of UTC.
Note, that JavaScript, Python and C return the difference between UTC and local time. Java, C# and Ruby return the difference between local time and UTC.
Implementation
external Duration get timeZoneOffset;
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https://api.dart.dev/stable/2.13.0/dart-core/DateTime/timeZoneOffset.html