如何将 Unix 时间戳转换为 DateTime,反之亦然?
-
05-07-2019 - |
题
有这个示例代码,但随后它开始谈论毫秒/纳秒问题。
MSDN 上也有同样的问题, C# 中自 Unix 纪元以来的秒数.
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);
}
}
解决方案
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;
}
其他提示
这 最新版本的.NET (v4.6) 添加了对 Unix 时间转换的内置支持。这包括以秒或毫秒表示的往返 Unix 时间。
- Unix 时间(以秒为单位)转换为 UTC
DateTimeOffset
:
DateTimeOffset dateTimeOffset = DateTimeOffset.FromUnixTimeSeconds(1000);
DateTimeOffset
转换为以秒为单位的 Unix 时间:
long unixTimeStampInSeconds = dateTimeOffset.ToUnixTimeSeconds();
- Unix 时间(以毫秒为单位)转换为 UTC
DateTimeOffset
:
DateTimeOffset dateTimeOffset = DateTimeOffset.FromUnixTimeMilliseconds(1000000);
DateTimeOffset
转换为 Unix 时间(以毫秒为单位):
long unixTimeStampInMilliseconds = dateTimeOffset.ToUnixTimeMilliseconds();
笔记:这些方法与 UTC 相互转换 DateTimeOffset
. 。为了得到一个 DateTime
表示只需使用 DateTimeOffset.UtcDateTime
或者 DateTimeOffset.LocalDateTime
特性:
DateTime dateTime = dateTimeOffset.UtcDateTime;
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;
}
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;
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 和 AddMilliseconds 也会切断双倍的微秒。
这些版本具有高精度:
Unix - >日期时间强>
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 强>
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;
}
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);
}
}
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);
}
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 DateTimeOffset结构中:
static DateTimeOffset FromUnixTimeSeconds(long seconds)
static DateTimeOffset FromUnixTimeMilliseconds(long milliseconds)
long DateTimeOffset.ToUnixTimeSeconds()
long DateTimeOffset.ToUnixTimeMilliseconds()
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;
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
成为一个全局静态,因此它只需要在项目中出现一次,如果UNIX时间在,则可以使用 AddSeconds
秒。
走另一条路:
double unixTimeInMilliseconds = timeToConvert.Subtract(unixEpoch).TotalMilliseconds;
根据需要截断到Int64和/或使用 TotalSeconds
。
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)。
var dt = DateTime.Now;
var unixTime = ((DateTimeOffset)dt).ToUnixTimeSeconds();
// 1510396991
var dt = DateTimeOffset.FromUnixTimeSeconds(1510396991);
// [11.11.2017 10:43:11 +00:00]
从.net 4.6开始,您可以这样做:
var dateTime = DateTimeOffset.FromUnixTimeSeconds(unixDateTime).DateTime;
我需要转换 timeval结构 (秒,微秒)包含 UNIX time
到 DateTime
而不会丢失精度而且没有在这里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);
}
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))
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);
}
}