如何将Unix时间戳转换为DateTime,反之亦然?

时间:2008-10-30 10:30:30

标签: c# datetime unix epoch data-conversion

有这个示例代码,但它开始讨论毫秒/纳秒问题。

同样的问题出在MSDN上, Seconds since the Unix epoch in C#

这是我到目前为止所得到的:

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);
  }
}

20 个答案:

答案 0 :(得分:917)

以下是您的需求:

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;
}

或者,对于Java(由于时间戳以毫秒为单位而不是秒,因此不同):

public static DateTime JavaTimeStampToDateTime( double javaTimeStamp )
{
    // Java timestamp is milliseconds past epoch
    System.DateTime dtDateTime = new DateTime(1970,1,1,0,0,0,0,System.DateTimeKind.Utc);
    dtDateTime = dtDateTime.AddMilliseconds( javaTimeStamp ).ToLocalTime();
    return dtDateTime;
}

答案 1 :(得分:334)

latest version of .NET (v4.6)增加了对Unix时间转换的内置支持。这包括来自Unix时间和来自Unix或毫秒的时间。

  • 以秒为单位的Unix时间DateTimeOffset

DateTimeOffset dateTimeOffset = DateTimeOffset.FromUnixTimeSeconds(1000);
  • DateTimeOffset以秒为单位的Unix时间:

long unixTimeStampInSeconds = dateTimeOffset.ToUnixTimeSeconds();
  • Unix时间(以毫秒为单位)到UTC DateTimeOffset

DateTimeOffset dateTimeOffset = DateTimeOffset.FromUnixTimeMilliseconds(1000000);
  • DateTimeOffset到Unix时间,以毫秒为单位:

long unixTimeStampInMilliseconds = dateTimeOffset.ToUnixTimeMilliseconds();

注意:这些方法与UTC DateTimeOffset进行转换。要获得DateTime代表,只需使用DateTimeOffset.UtcDateTimeDateTimeOffset.LocalDateTime属性:

DateTime dateTime = dateTimeOffset.UtcDateTime;

答案 2 :(得分:211)

DateTime to UNIX timestamp:

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

答案 3 :(得分:44)

  

UTC不随季节的变化而变化,但是当地时间或民间变化   如果时区管辖区遵守夏令时,时间可能会改变   时间(夏令时间)。例如,UTC提前5个小时(即   当天晚些时候在美国东海岸的当地时间   冬季的国家,但夏令时提前4小时   在那里观察。

所以这是我的代码:

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

答案 4 :(得分:23)

小心,如果你需要精度高于毫秒!

.NET(v4.6)方法(例如 FromUnixTimeMilliseconds )不提供此精度。

AddSeconds AddMilliseconds 也会切断双倍的微秒。

这些版本具有高精度:

Unix - >日期时间

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);
}

日期时间 - >的Unix

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;
}

答案 5 :(得分:13)

请参阅IdentityModel.EpochTimeExtensions

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);
    }
}

答案 6 :(得分:10)

为了补充ScottCher的答案,我最近发现自己处于令人讨厌的情况,即在输入数据集中任意混合使用秒和毫秒的UNIX时间戳。以下代码似乎处理得很好:

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);
}

答案 7 :(得分:7)

Unix时间转换是.NET Framework 4.6中的新功能。

现在,您可以更轻松地将日期和时间值转换为.NET Framework类型和Unix时间。例如,在JavaScript客户端和.NET服务器之间转换时间值时,这可能是必要的。以下API已添加到Systematically Releasing Objects

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

答案 8 :(得分:6)

您可以使用 DateTimeOffset

例如。我有DateTime对象

var dateTime1=DateTime.Now;

如果我想将其转换为Unix时间戳,可以实现以下目标

var unixTimeSeconds= new DateTimeOffset(dateTime1).ToUnixTimeSeconds()

如果要将unix timeStamp转换为正常的DateTime,可以使用以下代码段:

var dateTime2 = DateTimeOffset.FromUnixTimeMilliseconds(unixTimeSeconds).LocalDateTime;

var dateTime2 = DateTimeOffset.FromUnixTimeMilliseconds(unixTimeSeconds).UtcDateTime;

有关更多信息,请访问此链接:

DateTimeOffset.ToUnixTimeSeconds Method
DateTimeOffset.FromUnixTimeMilliseconds

答案 9 :(得分:5)

我只是将转换率与当地时间调整的1/1/1970进行比较,找到了正确的答案;

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;

答案 10 :(得分:3)

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

当然,可以使unixEpoch成为全局静态,因此它只需要在项目中出现一次,如果UNIX时间以秒为单位,则可以使用AddSeconds

走另一条路:

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

根据需要截断到Int64和/或使用TotalSeconds

答案 11 :(得分:2)

Unix滴答是1秒(如果我记得很清楚),.NET滴答是100纳秒。

如果您遇到纳秒问题,可能需要尝试使用AddTick(10000000 *值)。

答案 12 :(得分:2)

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

// 1510396991

var dt = DateTimeOffset.FromUnixTimeSeconds(1510396991);

// [11.11.2017 10:43:11 +00:00]

答案 13 :(得分:2)

在.net 4.6中,您可以执行以下操作:

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

答案 14 :(得分:1)

我需要将包含UNIX time的{​​{3}}(秒,微秒)转换为DateTime而不会失去精确度,并且未在此处找到答案,所以我想我可能会添加我的:

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);
}

答案 15 :(得分:1)

写了一个对我们有用的最简单的扩展名。如果有人找...

public static class DateTimeExtensions
{
    public static DateTime FromUnixTimeStampToDateTime(this string unixTimeStamp)
    {

        return DateTimeOffset.FromUnixTimeSeconds(long.Parse(unixTimeStamp)).UtcDateTime;
    }
}

答案 16 :(得分:1)

System.DateTimeOffset.Now.ToUnixTimeSeconds()

答案 17 :(得分:1)

Unix epoch 现在是 DateTime 类的一部分。将毫秒转换为日期时间就像

一样简单
DateTime.UnixEpoch.AddMilliseconds(millis)

答案 18 :(得分:0)

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();
        }
    }

你可以调用UnixTime.UnixTimeToDateTime(double datetime))

答案 19 :(得分:-2)

对于.NET 4.6及更高版本:

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);
    }
}