如何使用 C#/.NET 将日期时间转换为时间戳(忽略当前时区)

问题描述

如何使用 C# .NET 将日期时间转换为时间戳(忽略当前时区)?

How do I convert datetime to timestamp using C# .NET (ignoring the current timezone)?

我正在使用以下代码:

private long ConvertToTimestamp(DateTime value)
{
    long epoch = (value.ToUniversalTime().Ticks - 621355968000000000) / 10000000;
    return epoch;
}

但它会根据当前时区返回时间戳值 &我需要结果而不使用当前时区.

But it returns the timestamp value according to the current time zone & and I need the result without using the current timezone.

推荐答案

此时你正在调用 ToUniversalTime() - 摆脱它:

At the moment you're calling ToUniversalTime() - just get rid of that:

private long ConvertToTimestamp(DateTime value)
{
    long epoch = (value.Ticks - 621355968000000000) / 10000000;
    return epoch;
}

另外，更易读的 IMO:

Alternatively, and rather more readably IMO:

private static readonly DateTime Epoch = new DateTime(1970, 1, 1, 0, 0, 0, DateTimeKind.Utc);
...

private static long ConvertToTimestamp(DateTime value)
{
    TimeSpan elapsedTime = value - Epoch;
    return (long) elapsedTime.TotalSeconds;
}

如评论中所述，执行减法时不考虑您传入的 DateTime 的 Kind.您应该真正使用 Utc 的 Kind 传递一个值，以使其正常工作.不幸的是，DateTime 在这方面有点破旧 - 请参阅 我的博文(关于DateTime的咆哮)了解更多详情.

As noted in the comments, the Kind of the DateTime you pass in isn't taken into account when you perform subtraction. You should really pass in a value with a Kind of Utc for this to work. Unfortunately, DateTime is a bit broken in this respect - see my blog post (a rant about DateTime) for more details.

您可能想要使用我的 Noda Time 日期/时间 API，这会使一切变得更加清晰，IMO.

You might want to use my Noda Time date/time API instead which makes everything rather clearer, IMO.

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