这里有一个示例代码，但是它开始讨论毫秒/纳秒的问题。
同样的问题出现在MSDN上，从c#的Unix时代开始。
这是我目前得到的:
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);
}
}
当前回答
如果您需要高于毫秒的精度，请小心!
. net (v4.6)方法(例如fromunixtimemillisecseconds)不提供这种精度。
AddSeconds和AddMilliseconds还截断了double中的微秒。
这些版本有很高的精度:
Unix -> DateTime
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-> 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;
}
其他回答
我找到了正确的答案，只是通过比较转换到1/1/1970 w/o当地时间调整;
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;
我需要将包含UNIX时间的timeval结构体(秒，微秒)转换为DateTime而不损失精度，在这里还没有找到答案，所以我想我只是可能会添加我的:
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);
}
在。net 4.6中，你可以这样做:
var dateTime = DateTimeOffset.FromUnixTimeSeconds(unixDateTime).DateTime;
看到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);
}
}
System.DateTimeOffset.Now.ToUnixTimeSeconds()
