private void ControlsToData()
{
var years = (int) numYears.Value;
var months = (int) numMonths.Value;
var days = (int) numDays.Value;
var hours = (int) numHours.Value;
var minutes = (int) numMinutes.Value;
var seconds = (int) numSeconds.Value;
days += (int) (years*ApproxDaysPerYear) + (int) (months*ApproxDaysPerMonth);
_timeSpan = new TimeSpan(days, hours, minutes, seconds);
}