mxSecond method
Implementation
int mxSecond(DateTime other) {
var millisMinus =
this.millisecondsSinceEpoch - other.millisecondsSinceEpoch;
if (millisMinus < 0) millisMinus = 0;
return ((millisMinus).abs() * 1.0 / 1000 -
this.mxDay(other) * 86400 -
this.mxHour(other) * 3600 -
this.mxMinute(other) * 60)
.toInt();
}