public static string SqlLiteralTime(this TimeSpan?d, SqlTimeOptions options) => d.HasValue ? d.Value.SqlLiteralTime(options) : SqlOptions.SqlNullString;
public static string SqlLiteralTime(this TimeSpan d, SqlTimeOptions options) => options.LiteralPrefix + d.ToSqlTime(options.MilliSecondsPrecision) + options.LiteralSuffix;