using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.IO;
using System.Reflection;
using System.Runtime.InteropServices;

namespace BatchService.Framework.Utility
{
    public static class DateTimeUtil
    {
        [StructLayout(LayoutKind.Sequential)]
        public struct SYSTEMTIME
        {
            public ushort wYear;
            public ushort wMonth;
            public ushort wDayOfWeek;
            public ushort wDay;
            public ushort wHour;
            public ushort wMinute;
            public ushort wSecond;
            public ushort wMilliseconds;

            public void FromDateTime(DateTime dateTime)
            {
                wYear = (ushort)dateTime.Year;
                wMonth = (ushort)dateTime.Month;
                wDayOfWeek = (ushort)dateTime.DayOfWeek;
                wDay = (ushort)dateTime.Day;
                wHour = (ushort)dateTime.Hour;
                wMinute = (ushort)dateTime.Minute;
                wSecond = (ushort)dateTime.Second;
                wMilliseconds = (ushort)dateTime.Millisecond;
            }

            public DateTime ToDateTime()
            {
                return new DateTime(wYear, wMonth, wDay, wHour, wMinute, wSecond);
            }
        }
        //设定，获取系统时间,SetSystemTime()默认设置的为UTC时间，比北京时间少了8个小时。  
        [DllImport("Kernel32.dll")]
        public static extern bool SetSystemTime(ref SYSTEMTIME time);
        [DllImport("Kernel32.dll")]
        public static extern bool SetLocalTime(ref SYSTEMTIME time);
        [DllImport("Kernel32.dll")]
        public static extern void GetSystemTime(ref SYSTEMTIME time);
        [DllImport("Kernel32.dll")]
        public static extern void GetLocalTime(ref SYSTEMTIME time);
        /// <summary> 
        /// 微信的CreateTime是当前与1970-01-01 00:00:00之间的秒数        /// </summary> 
        /// <param name=“dt”></param>        /// <returns></returns> 
        public static string DateTimeToInt(this DateTime dt)
        {
            System.DateTime startTime = TimeZone.CurrentTimeZone.ToLocalTime(new System.DateTime(1970, 1, 1, 0, 0, 0, 0));
            //intResult = (time- startTime).TotalMilliseconds; 
            long t = (dt.Ticks - startTime.Ticks) / 10000000;            //现在是10位，除10000调整为13位 
            return t.ToString();
        }
    }
}