inMilliseconds property
int inMillisecondsReturns number of whole milliseconds spanned by this Duration.
The returned value can be greater than 999.
Source
int get inMilliseconds => _duration ~/ Duration.MICROSECONDS_PER_MILLISECOND;
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Licensed under the Creative Commons Attribution-ShareAlike License v4.0.
https://api.dartlang.org/stable/1.24.3/dart-core/Duration/inMilliseconds.html