seconds property
Moves the thumbs based on seconds.
For example, if min is DateTime(2000, 01, 01, 05, 10, 00) and
max is DateTime(2006, 01, 01, 05, 12, 00) and
SliderDuration(seconds: 30) then the thumb will get moved at
DateTime(2006, 01, 01, 05, 10, 00), DateTime(2006, 01, 01, 05, 10, 30)),
DateTime(2006, 01, 01, 05, 11, 00), DateTime(2006, 01, 01, 05, 11, 30),
and DateTime(2006, 01, 01, 05, 12, 00).
Implementation
final int seconds;