private static HoursMinutesSecondsChange PartChange(HoursMinutesSecondsChange currentValue,DateTimeDigits first,DateTimeDigits second,HoursMinutesSecondsChange firstValue,HoursMinutesSecondsChange secondValue)
{
var digitChange = first - second;
if (digitChange.HasFlag(DigitChange.First))
{
currentValue |= firstValue;
}
if (digitChange.HasFlag(DigitChange.Second))
{
currentValue |= secondValue;
}
return currentValue;
}