/// <summary>
/// return if this instance can Contain an other instance
/// </summary>
public bool contain(DayWork obj)
{
return(obj.begin.sumMinuts() - begin.sumMinuts() >= 0 && obj.end.sumMinuts() - end.sumMinuts() <= 0);
}
/// <summary>
/// return number that use to compareble
/// </summary>
public int Fixed(DayWork obj)
{
return(obj.sumMinuts - sumMinuts);
}