关于C#：如何将Unix时间戳转换为datetime，反之亦然？

How can I convert a Unix timestamp to DateTime and vice versa?

这里有一个示例代码，但随后它开始讨论毫秒/纳秒问题。

同样的问题出现在msdn上，这是自c中的unix时代以来的秒数。

这就是我到目前为止所得到的：

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public Double CreatedEpoch
{
get
{
DateTime epoch = new DateTime(1970, 1, 1, 0, 0, 0, 0).ToLocalTime();
TimeSpan span = (this.Created.ToLocalTime() - epoch);
return span.TotalSeconds;
}
set
{
DateTime epoch = new DateTime(1970, 1, 1, 0, 0, 0, 0).ToLocalTime();
this.Created = epoch.AddSeconds(value);
}
}

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这是你需要的

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public static DateTime UnixTimeStampToDateTime( double unixTimeStamp )
{
// Unix timestamp is seconds past epoch
System.DateTime dtDateTime = new DateTime(1970,1,1,0,0,0,0,System.DateTimeKind.Utc);
dtDateTime = dtDateTime.AddSeconds( unixTimeStamp ).ToLocalTime();
return dtDateTime;
}

然而，对于爪哇(由于时间的推移在毫秒，而不是秒)：

ZZU1

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最新版本的网络(V4.6)已添加到支持UNIX时间转换。这包括从Unix到United Nations time，由Either Seconds或Milliseconds代表。

Unix time in seconds to UTC DateTimeOffset

1	DateTimeOffset dateTimeOffset = DateTimeOffset.FromUnixTimeSeconds(1000);

To Unix Time in Seconds:

1	long unixTimeStampInSeconds = dateTimeOffset.ToUnixTimeSeconds();

Unix Time in Millesconds to UTC DateTimeOffset

1	DateTimeOffset dateTimeOffset = DateTimeOffset.FromUnixTimeMilliseconds(1000000);

To Unix Time in Millesconds:

1	long unixTimeStampInMilliseconds = dateTimeOffset.ToUnixTimeMilliseconds();

注：这些方法从一个UTC DateTimeOffset转为另一个UTC DateTimeOffset。To get a DateTimerepresentation simply use the DateTimeOffset.UtcDateTimeor DateTimeOffset.LocalDateTimeprotections：

1	DateTime dateTime = dateTimeOffset.UtcDateTime;

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Datetime to UNIX Timestamp：

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public static double DateTimeToUnixTimestamp(DateTime dateTime)
{
return (TimeZoneInfo.ConvertTimeToUtc(dateTime) -
new DateTime(1970, 1, 1, 0, 0, 0, 0, System.DateTimeKind.Utc)).TotalSeconds;
}

"UTC does not change with a change of seasons，but local time or civil time may change if a time zone jurisdiction observers daylight saving time(summer time).例如，UTC在冬季期间离美国东岸大约5小时(这一天比)晚，但在冬季后期约4小时。"

这是我的代码

1 2	TimeSpan span = (DateTime.UtcNow - new DateTime(1970, 1, 1, 0, 0, 0, 0,DateTimeKind.Utc)); double unixTime = span.TotalSeconds;

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小心点，如果你需要比毫秒更精确的话！

Net(V4.6)Methods(E.G.Fromunixtimemilliseconds)don't provide this precision.

添加剂和添加剂还将微秒切割到双。

These versions have high precision:

大学日期

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public static DateTime UnixTimestampToDateTime(double unixTime)
{
DateTime unixStart = new DateTime(1970, 1, 1, 0, 0, 0, 0, System.DateTimeKind.Utc);
long unixTimeStampInTicks = (long) (unixTime * TimeSpan.TicksPerSecond);
return new DateTime(unixStart.Ticks + unixTimeStampInTicks, System.DateTimeKind.Utc);
}

联合国大学

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public static double DateTimeToUnixTimestamp(DateTime dateTime)
{
DateTime unixStart = new DateTime(1970, 1, 1, 0, 0, 0, 0, System.DateTimeKind.Utc);
long unixTimeStampInTicks = (dateTime.ToUniversalTime() - unixStart).Ticks;
return (double) unixTimeStampInTicks / TimeSpan.TicksPerSecond;
}

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See identitymodel.epochtimextensions

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public static class EpochTimeExtensions
{
/// <summary>
/// Converts the given date value to epoch time.
/// </summary>
public static long ToEpochTime(this DateTime dateTime)
{
var date = dateTime.ToUniversalTime();
var ticks = date.Ticks - new DateTime(1970, 1, 1, 0, 0, 0, 0, DateTimeKind.Utc).Ticks;
var ts = ticks / TimeSpan.TicksPerSecond;
return ts;
}

/// <summary>
/// Converts the given date value to epoch time.
/// </summary>
public static long ToEpochTime(this DateTimeOffset dateTime)
{
var date = dateTime.ToUniversalTime();
var ticks = date.Ticks - new DateTimeOffset(1970, 1, 1, 0, 0, 0, TimeSpan.Zero).Ticks;
var ts = ticks / TimeSpan.TicksPerSecond;
return ts;
}

/// <summary>
/// Converts the given epoch time to a <see cref="DateTime"/> with <see cref="DateTimeKind.Utc"/> kind.
/// </summary>
public static DateTime ToDateTimeFromEpoch(this long intDate)
{
var timeInTicks = intDate * TimeSpan.TicksPerSecond;
return new DateTime(1970, 1, 1, 0, 0, 0, 0, DateTimeKind.Utc).AddTicks(timeInTicks);
}

/// <summary>
/// Converts the given epoch time to a UTC <see cref="DateTimeOffset"/>.
/// </summary>
public static DateTimeOffset ToDateTimeOffsetFromEpoch(this long intDate)
{
var timeInTicks = intDate * TimeSpan.TicksPerSecond;
return new DateTimeOffset(1970, 1, 1, 0, 0, 0, TimeSpan.Zero).AddTicks(timeInTicks);
}
}

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为了补充Scottcher's answer，我最近发现自己在一个年夜的场景中，两者都是第二次和毫秒的Unix Timestamps任意混合在一个输入数据集中。The following code seems to handle this well：

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static readonly DateTime UnixEpoch = new DateTime(1970, 1, 1, 0, 0, 0, 0, DateTimeKind.Utc);
static readonly double MaxUnixSeconds = (DateTime.MaxValue - UnixEpoch).TotalSeconds;

public static DateTime UnixTimeStampToDateTime(double unixTimeStamp)
{
return unixTimeStamp > MaxUnixSeconds
? UnixEpoch.AddMilliseconds(unixTimeStamp)
: UnixEpoch.AddSeconds(unixTimeStamp);
}

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UNIX time transformation is new in net framework 4.6.

现在，您可以更容易地转换日期和时间值到或从净框架类型和UNIX时间。This can be necessary，for example，when conversing time values between a Javascript client and net server.The following apis have been added to the datetimeofset structure：

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static DateTimeOffset FromUnixTimeSeconds(long seconds)
static DateTimeOffset FromUnixTimeMilliseconds(long milliseconds)
long DateTimeOffset.ToUnixTimeSeconds()
long DateTimeOffset.ToUnixTimeMilliseconds()

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I found the right answer just comparing the transion to 1/1/1970 W/O the local time adjustment；

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DateTime date = new DateTime(2011, 4, 1, 12, 0, 0, 0);
DateTime epoch = new DateTime(1970, 1, 1, 0, 0, 0, 0);
TimeSpan span = (date - epoch);
double unixTime =span.TotalSeconds;

1 2	DateTime unixEpoch = DateTime.ParseExact("1970-01-01","yyyy-MM-dd", System.Globalization.CultureInfo.InvariantCulture); DateTime convertedTime = unixEpoch.AddMilliseconds(unixTimeInMillisconds);

如果UNIX时间在后面，则需要有一次在你的项目中出现。

To go the other way:

1	double unixTimeInMilliseconds = timeToConvert.Subtract(unixEpoch).TotalMilliseconds;

如有必要，可使用TotalSeconds。

一张单子是第二张(如果我还记得的话)，一张单子是100 。

如果你遇到纳米问题，你可能想尝试使用Addick(1000000*value).

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From Net 4.6，you can do this：

1	var dateTime = DateTimeOffset.FromUnixTimeSeconds(unixDateTime).DateTime;

1 2	var dt = DateTime.Now; var unixTime = ((DateTimeOffset)dt).ToUnixTimeSeconds();

页：1

1	var dt = DateTimeOffset.FromUnixTimeSeconds(1510396991);

//[11.11.2017 10：43：11+00：00]

我需要转换一个包含UNIX time的时间结构，以便DateTime〔1〕没有失去精确性，也没有找到答案。

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DateTime _epochTime = new DateTime(1970, 1, 1, 0, 0, 0, DateTimeKind.Utc);
private DateTime UnixTimeToDateTime(Timeval unixTime)
{
return _epochTime.AddTicks(
unixTime.Seconds * TimeSpan.TicksPerSecond +
unixTime.Microseconds * TimeSpan.TicksPerMillisecond/1000);
}

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public static class UnixTime
{
private static readonly DateTime Epoch = new DateTime(1970, 1, 1, 0, 0, 0, 0);

public static DateTime UnixTimeToDateTime(double unixTimeStamp)
{
return Epoch.AddSeconds(unixTimeStamp).ToUniversalTime();
}
}

你可以称为UNIXTIME.UNIXTIME(双日期)

For Net 4.6 and later：

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public static class UnixDateTime
{
public static DateTimeOffset FromUnixTimeSeconds(long seconds)
{
if (seconds < -62135596800L || seconds > 253402300799L)
throw new ArgumentOutOfRangeException("seconds", seconds,"");

return new DateTimeOffset(seconds * 10000000L + 621355968000000000L, TimeSpan.Zero);
}

public static DateTimeOffset FromUnixTimeMilliseconds(long milliseconds)
{
if (milliseconds < -62135596800000L || milliseconds > 253402300799999L)
throw new ArgumentOutOfRangeException("milliseconds", milliseconds,"");

return new DateTimeOffset(milliseconds * 10000L + 621355968000000000L, TimeSpan.Zero);
}

public static long ToUnixTimeSeconds(this DateTimeOffset utcDateTime)
{
return utcDateTime.Ticks / 10000000L - 62135596800L;
}

public static long ToUnixTimeMilliseconds(this DateTimeOffset utcDateTime)
{
return utcDateTime.Ticks / 10000L - 62135596800000L;
}

[Test]
public void UnixSeconds()
{
DateTime utcNow = DateTime.UtcNow;
DateTimeOffset utcNowOffset = new DateTimeOffset(utcNow);

long unixTimestampInSeconds = utcNowOffset.ToUnixTimeSeconds();

DateTimeOffset utcNowOffsetTest = UnixDateTime.FromUnixTimeSeconds(unixTimestampInSeconds);

Assert.AreEqual(utcNowOffset.Year, utcNowOffsetTest.Year);
Assert.AreEqual(utcNowOffset.Month, utcNowOffsetTest.Month);
Assert.AreEqual(utcNowOffset.Date, utcNowOffsetTest.Date);
Assert.AreEqual(utcNowOffset.Hour, utcNowOffsetTest.Hour);
Assert.AreEqual(utcNowOffset.Minute, utcNowOffsetTest.Minute);
Assert.AreEqual(utcNowOffset.Second, utcNowOffsetTest.Second);
}

[Test]
public void UnixMilliseconds()
{
DateTime utcNow = DateTime.UtcNow;
DateTimeOffset utcNowOffset = new DateTimeOffset(utcNow);

long unixTimestampInMilliseconds = utcNowOffset.ToUnixTimeMilliseconds();

DateTimeOffset utcNowOffsetTest = UnixDateTime.FromUnixTimeMilliseconds(unixTimestampInMilliseconds);

Assert.AreEqual(utcNowOffset.Year, utcNowOffsetTest.Year);
Assert.AreEqual(utcNowOffset.Month, utcNowOffsetTest.Month);
Assert.AreEqual(utcNowOffset.Date, utcNowOffsetTest.Date);
Assert.AreEqual(utcNowOffset.Hour, utcNowOffsetTest.Hour);
Assert.AreEqual(utcNowOffset.Minute, utcNowOffsetTest.Minute);
Assert.AreEqual(utcNowOffset.Second, utcNowOffsetTest.Second);
Assert.AreEqual(utcNowOffset.Millisecond, utcNowOffsetTest.Millisecond);
}
}

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