C#10，帶來了Date和Time類型
2022-04-25 22:55:51

//從DateTime轉換
Console.WriteLine(DateOnly.FromDateTime(DateTime.Now));
//從字會串轉換
Console.WriteLine(DateOnly.Parse("2021-10-23"));
//從0001-01-01到現在的天數
Console.WriteLine(DateOnly.FromDayNumber(738085)); 
//從DateTime轉換
Console.WriteLine(TimeOnly.FromDateTime(DateTime.Now));
//從TimeSpan轉換
Console.WriteLine(TimeOnly.FromTimeSpan(new TimeSpan(12,12,12)));
//從字符串轉換
Console.WriteLine(TimeOnly.Parse("12:13:14"));
//從帶格式的字t會串轉換
Console.WriteLine(TimeOnly.ParseExact("12時13分14秒","HH時mm分ss秒"));

CREATE TABLE [dbo].[Test](
  [ID] [int] IDENTITY(1,1) NOT NULL,
  [CreateDate] [date] NULL,
  [CreateTime] [time](7) NULL
) ON [PRIMARY]

using var con = new SqlConnection("server=.;database=testdb;uid=sa;pwd=sa;TrustServerCertificate=True;");
var sql = @"
INSERT INTO [dbo].[Test]
           ([CreateDate]
           ,[CreateTime])
     VALUES
           (@CreateDate
           ,@CreateTime)";
using var cmd = new SqlCommand(sql, con);
con.Open();
cmd.Parameters.Add(new SqlParameter("@CreateDate", SqlDbType.Date) { Value = DateOnly.FromDateTime(DateTime.Now) });
cmd.Parameters.Add(new SqlParameter("@CreateTime", SqlDbType.Time) { Value = TimeOnly.FromDateTime(DateTime.Now) });
cmd.ExecuteNonQuery();