Question

我正在尝试将当前年份+ 1午夜日期时间转换为unix时间戳。

因为我已经尝试了

DateTime currentTime = DateTime.Today;
DateTime yearEnd = new DateTime( currentTime.Year, 1,1,currentTime.Minute,currentTime.Hour,currentTime.Second,DateTimeKind.Local);

yearEnd = yearEnd.AddYears(1);

double t = (yearEnd.ToUniversalTime() - new DateTime(1970, 1, 1,0,0,0)).TotalMilliseconds;

以上代码正在返回1514782800000，即Mon Jan 01 2018 05:00:00 UTC和Mon Jan 01 2018 10:30:00 Local（印度）

我期待的是它将时间转换为Mon Jan 01 2018 00:00:00当地时间

Answer 1

默认情况下DateTime会创建Unspecified DateTimeKind，因此明确使用UTC有助于避免混淆。我试图以这种方式改写

    DateTime currentTime = DateTime.UtcNow;
    DateTime yearEnd = new DateTime( currentTime.Year, 1,1,0,0,0, DateTimeKind.Utc);

    yearEnd = yearEnd.AddYears(1); // output DateTime has Utc Kind

    var unixTimestamp = (yearEnd.Subtract(new DateTime(1970, 1, 1, 0, 0, 0, DateTimeKind.Utc))).TotalMilliseconds;

    Console.WriteLine(unixTimestamp);

输出为1514764800000，转换为GMT: Monday, 1 January 2018 00:00:00

<强>更新

如果您需要将时间戳转换回DateTime，您可以使用以下内容：

public static DateTime UnixTimeStampToDateTime(double unixTimeStamp)
{
    System.DateTime dtDateTime = new DateTime(1970,1,1,0,0,0,0,System.DateTimeKind.Utc);
    dtDateTime = dtDateTime.AddMilliseconds(unixTimeStamp);
    return dtDateTime; // still Utc Kind
}

用法示例，如果您需要转换为其他时区：

    TimeZoneInfo infotime = TimeZoneInfo.FindSystemTimeZoneById("Eastern Standard Time (Mexico)"); // specify your desired timezone here
    Console.WriteLine(TimeZoneInfo.ConvertTimeFromUtc(UnixTimeStampToDateTime(unixTimestamp), infotime));

Answer 2

如果我理解你，你需要以下内容：

double result = new DateTime(currentTime.Year + 1, 1, 1, 0, 0, 0, DateTimeKind.Local).Subtract(new DateTime(1970, 1, 1, 0, 0, 0, DateTimeKind.Utc)).TotalSeconds;

或改善了可读性

DateTime newYear = new DateTime(currentTime.Year + 1, 1, 1, 0, 0, 0, DateTimeKind.Utc);
DateTime uTSBegin = new DateTime(1970, 1, 1, 0, 0, 0, DateTimeKind.Utc);
double result2 = newYear.Subtract(uTSBegin).TotalSeconds;

将1 +午夜时间转换为unix毫秒

2 个答案: