public static long EstStartOfSeasonAt(long ticks)
{
var currentDayTicks = (int)(GenDate.CurrentDayPercent * GenDate.TicksPerDay);
var dayOfSeason = GenDate.DayOfSeasonZeroBasedAt(ticks);
var currentSeasonDayTicks = DaysToTicks(dayOfSeason);
return(ticks - currentDayTicks - currentSeasonDayTicks);
}