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

Question

There is this example code, but then it starts talking about millisecond / nanosecond problems.

The same question is on MSDN, Seconds since the Unix epoch in C#<

Answer 1

For .NET 4.6 and later:

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);
    }
}