Convert String to linq condition Entity Framework core

You cannot compare a DateTime variable with a String variable.

So you need to create a DateTime. May design pattern can help a bit for your special case like Factory Pattern ;)

Look at

DbTransectionFunctions

Here is a sample codes

var entity = dbContext.MyTable
    .Where(w => DbFunctions.TruncateTime(w.SavedDateOnDb) == model.SelectedDate)
    .First();

Another sample like this after ef6 :)

var list = db.MyClass.Where(c=> DbFunctions.TruncateTime(c.DbrecordDate) 
                                       > DbFunctions.TruncateTime(DateTime.UtcNow));