Lambda Cast

var convertStrategy =
   rowDef.UpdateFrequency.Equals("MONTHLY", StringComparison.InvariantCultureIgnoreCase)
      ? (Func<DateTime, DateTime>) (e => new DateTime(e.Year, e.Month, 1))
      : (Func<DateTime, DateTime>) (e => new DateTime(e.Year, 1, 1));

One of `(Func<DateTime, DateTime>)` casts is redundant, i.e. it is possible to remove either of them.
But even if I replace `var` with `Func<DateTime, DateTime>` I still need one of them.