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var nw = DateTime.Now;
var target = nw.Date.Add(TimeSpan.FromHours(21).Add(TimeSpan.FromMinutes(21)));
var duration = target.Subtract(nw).TotalSeconds;
或者var nw = DateTime.Now;
var target = new DateTime(nw.Year, nw.Month, nw.Day, 21, 21, 0);
var duration = target.Subtract(nw).TotalSeconds;