Can not yet make it to work. That's my latest attempt which blows up in run-time:

 var startTime = new DateTime(1900, 1, 1, beginDateTime.Hour, beginDateTime.Minute, 0);
                var endTime = new DateTime(1900, 1, 1, endDateTime.Hour, endDateTime.Minute, 0);
                var daysOfWeek = dailyLimits.Where(dl => dl.Selected == true).Select(ds => ds.WeekDay).ToList();
                if (daysOfWeek.Count() < 7) // not all days of the week selected
                {
                    query = query.Where(m4s => DateTime.Parse("01-01-1900 " + m4s.StartTime.Value.ToShortTimeString()) <= endTime &&
                    DateTime.Parse("01-01-1900 " + m4s.EndTime.Value.ToShortTimeString()) >= startTime && daysOfWeek.Contains((short)m4s.StartTime.Value.DayOfWeek));
                }

about the Parse problem. Has anyone deal with this problem already of getting time portion of the date using LINQ?

Thanks in advance.

UPDATE. Tried TimeOfDay and it worked in my quick test, but the code it produced is not a clear conversion to time as I hoped. Still looking for better solutions.