Timecard:

{
    public class Timecard
    {
        public int Id { get; set; }
        public string UserId { get; set; }
        public DateTime StartDate { get; set; }
        public DateTime EndDate { get; set; }
        public Status Status {get;set;}
        public int TotalHours { get; set; }

        public virtual List<Workday> Workdays { get; set; }
    }

    public enum Status
    {
        Submitted, Denied, Approved
    }
}


TimecardEntry:

public class Workday
    {
        public int Id { get; set; }
        public int TimecardId { get; set; }
        public DateTime Date { get; set; }
        public int Hours { get; set; }
        public virtual Timecard Timecard { get; set; }

    }