Alert Date

// Assuming employee.PermanentEndDate is DateTime? (nullable DateTime)
if (employee.PermanentEndDate.HasValue)
{
    var empPermanentEndDate = employee.PermanentEndDate.Value.Date; // Use .Date to ignore the time part
    var today = DateTime.Today;
    var previousDay = DateTime.Today.AddDays(-1);

    if (empPermanentEndDate == previousDay && previousDay == today)
    {
        // Do something if empPermanentEndDate is the same as yesterday and today
    }
    else if (empPermanentEndDate == previousDay)
    {
        // Do something if empPermanentEndDate is the same as yesterday but not today
    }
    else if (empPermanentEndDate == today)
    {
        // Do something if empPermanentEndDate is the same as today but not yesterday
    }
    else
    {
        // Do something if empPermanentEndDate is neither today nor yesterday
    }
}