using System;
using System.Collections.Generic;
using System.Text;
using System.Threading;

namespace Ips.Library.Basic
{
    public static class DateTimeUtil
    {
        public const string DefaultDisplayFmt = "yyyy-MM-dd HH:mm:ss";

        public const string DefaultNumFmt = "yyyyMMddHHmmss";

        public static readonly DateTime _DT1970 = new DateTime(1970, 1, 1, 8, 0, 0);

        public static long To1970s(DateTime source)
        {
            return (long)(source - _DT1970).TotalSeconds;
        }

        public static long To1970ms(DateTime source)
        {
            return (long)(source - _DT1970).TotalMilliseconds;
        }

        public static DateTime From1970s(long seconds)
        {
            return _DT1970.AddSeconds(seconds);
        }

        public static DateTime From1970ms(long milliseconds)
        {
            return _DT1970.AddMilliseconds(milliseconds);
        }

        public static void WaitTime(DateTime time)
        {
            if (time <= DateTime.Now) return;
            while (true)
            {
                Thread.Sleep(100);
                if (time <= DateTime.Now) break;
            }
        }
    }
}