public IEnumerable <DateRange> SplitByHalfHour()
{
if (Start.EndOfHalfHour() == Stop.EndOfHalfHour())
{
return new[] { this }
}
;
var t = Start.EndOfHalfHour().AddTicks(1);
return(new[] { new DateRange(Start, t) }.Concat(new DateRange(t, Stop).SplitByHalfHour()));
}
