C#设置系统时间

Question

        [DllImport("kernel32.dll", EntryPoint = "GetSystemDefaultLCID")]
        public static extern int GetSystemDefaultLCID();
        [DllImport("kernel32.dll", EntryPoint = "SetLocaleInfoA")]
        public static extern int SetLocaleInfo(int Locale, int LCType, string lpLCData);        public const int LOCALE_SSHORTDATE = 0x1F;
        public static void SetTimeForMat()
        {
            try
            {
                //读写注册表                int x = GetSystemDefaultLCID();
                SetLocaleInfo(x, LOCALE_SSHORTDATE, "yyyy-MM-dd");   //短日期格式   
            }
            catch
            {            }
        }为什么程序中datetimepicker控件的显示还是没变？

Answer 1

你改系统时间也影响不到datetimepicker呀，如果你不用代码对datetimepicker时间进行设置的话，datetimepicker的时间一直是你放上这个控件时显示的日期

Answer 2

this.datetimepicker.Value = System.DateTime.Now;

Answer 3

//引用 
using System.Runtime.InteropServices;
 //api函数声明 
        [DllImport("kernel32.dll", SetLastError = true)]
        static extern bool SetSystemTime(ref SYSTEMTIME time);
        public struct SYSTEMTIME
        {
            public short Year;
            public short Month;
            public short DayOfWeek;
            public short Day;
            public short Hour;
            public short Minute;
            public short Second;
            public short Milliseconds;
        }
        private  void Setdatetime()
        {
            //调用代码 
            DateTime idag = new DateTime((int)DateTime.Now.AddYears(1).Year,//增加年
                (int)DateTime.Now.AddMonths(0).Month,//增加月
                (int)DateTime.Now.AddDays(0).Day,//增加天
                (int)(DateTime.Now.AddHours(0).Hour),//增加小时
                (int)(DateTime.Now.AddMinutes(0).Minute),//增加分
                (int)(DateTime.Now.AddSeconds(0).Second),//增加秒
                DateTimeKind.Local);
            SYSTEMTIME s = new SYSTEMTIME();
            s.Year = (short)idag.Year;
            s.Month = (short)idag.Month;
            s.DayOfWeek = (short)idag.DayOfWeek;
            s.Day = (short)idag.Day;
            s.Hour = (short)idag.Hour;
            s.Minute = (short)idag.Minute;
            s.Second = (short)idag.Second;
            s.Milliseconds = (short)idag.Millisecond;
            bool v= SetSystemTime(ref s);
            Console.WriteLine(v.ToString());
        } //修改系统时间用Datetime.Now获取没问题

Answer 4

这么多够吗？
//获取日期+时间
DateTime.Now.ToString();            // 2008-9-4 20:02:10
DateTime.Now.ToLocalTime().ToString();        // 2008-9-4 20:12:12//获取日期
DateTime.Now.ToLongDateString().ToString();    // 2008年9月4日
DateTime.Now.ToShortDateString().ToString();    // 2008-9-4
DateTime.Now.ToString("yyyy-MM-dd");        // 2008-09-04
DateTime.Now.Date.ToString();            // 2008-9-4 0:00:00//获取时间
DateTime.Now.ToLongTimeString().ToString();   // 20:16:16
DateTime.Now.ToShortTimeString().ToString();   // 20:16
DateTime.Now.ToString("hh:mm:ss");        // 08:05:57
DateTime.Now.TimeOfDay.ToString();        // 20:33:50.7187500//其他
DateTime.ToFileTime().ToString();       // 128650040212500000
DateTime.Now.ToFileTimeUtc().ToString();   // 128650040772968750
DateTime.Now.ToOADate().ToString();       // 39695.8461709606
DateTime.Now.ToUniversalTime().ToString();   // 2008-9-4 12:19:14DateTime.Now.Year.ToString();          获取年份   // 2008
DateTime.Now.Month.ToString();      获取月份   // 9
DateTime.Now.DayOfWeek.ToString(); 获取星期   // Thursday
DateTime.Now.DayOfYear.ToString(); 获取第几天   // 248
DateTime.Now.Hour.ToString();          获取小时   // 20
DateTime.Now.Minute.ToString();     获取分钟   // 31
DateTime.Now.Second.ToString();     获取秒数   // 45