using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace LYFZ.WinAPI
{
    /// <summary>
    /// 时间戳转换
    /// </summary>
    public class TimeStampConversion
    {
        public TimeStampConversion()
        {

        }
        /// <summary>
        /// 时间戳开始时间
        /// </summary>
        static DateTime TimeStampStartTime
        {
            get
            {
                return TimeZone.CurrentTimeZone.ToLocalTime(new System.DateTime(1970, 1, 1)); // 当地时区
            }
        }

        /// <summary>
        /// DateTime转换为JavaScript时间戳 13位数长度
        /// </summary>
        /// <param name="t"></param>
        /// <returns></returns>
        public static long DateTimeToJavaScriptTimeStamp(DateTime t)
        {
            return (long)(t - TimeStampConversion.TimeStampStartTime).TotalMilliseconds; //相差毫秒数
        }

        /// <summary>
        /// JavaScript时间戳转换为DateTime
        /// </summary>
        /// <param name="t"></param>
        /// <returns></returns>
        public static System.DateTime JavaScriptTimeStampToDateTime(long timeStamp)
        {
            return TimeStampConversion.TimeStampStartTime.AddMilliseconds(timeStamp);
        }

        /// <summary>
        /// DateTime转换为Unix时间戳 10位数长度
        /// </summary>
        /// <param name="timeStamp"></param>
        /// <returns></returns>
        public static long DateTimeToUnixTimeStamp(DateTime t)
        {
            return (long)(t - TimeStampConversion.TimeStampStartTime).TotalSeconds; // 相差秒数
        }

        /// <summary>
        /// Unix时间戳转换为DateTime
        /// </summary>
        /// <param name="timeStamp"></param>
        /// <returns></returns>
        public static System.DateTime UnixTimeStampToDateTime(long timeStamp)
        {
            return TimeStampConversion.TimeStampStartTime.AddSeconds(timeStamp);
        }
    }
}