How can I specify the latest time of day with DateTime

Question

I am using a System.DateTime object to allow a user to select a date range. The user is only able to select a date (not time) using a third party calendar so I

Answer 1

Based on the other answers I created this convenient extension method:

public static class DateTimeExtensions
{
    public static DateTime EndOfDay(this DateTime dateTime)
    {
        return dateTime.Date.AddDays(1).AddTicks(-1);
    }
}