/// <summary>
/// Advances to week day.
/// </summary>
/// <param name="value">The value.</param>
/// <param name="weekDay">The week day.</param>
/// <returns></returns>
public static DateTime AdvanceToWeekDay(this DateTime value, WeekDay weekDay)
{
if (!weekDay.HasValue())
{
throw new ArgumentException("The weekDay has to be set", "weekDay");
}
int target = (int)weekDay;
int from = (int)value.GetWeekDay();
int offSet = target - from;
// check if we have to jump the week
if (offSet < 0)
{
offSet = offSet + 7;
}
var result = value.AddDays(offSet);
return(result);
}
