How do you convert epoch time in C#?

Question

How do you convert Unix epoch time into real time in C#? (Epoch beginning 1/1/1970)

Answer 1

I presume that you mean Unix time, which is defined as the number of seconds since midnight (UTC) on 1st January 1970.

private static readonly DateTime epoch = new DateTime(1970, 1, 1, 0, 0, 0, DateTimeKind.Utc);

public static DateTime FromUnixTime(long unixTime)
{
    return epoch.AddSeconds(unixTime);
}

UPDATE 2020

You can do this with DateTimeOffset

DateTimeOffset dateTimeOffset = DateTimeOffset.FromUnixTimeSeconds(epochSeconds);
DateTimeOffset dateTimeOffset2 = DateTimeOffset.FromUnixTimeMilliseconds(epochMilliseconds);

And if you need the DateTime object instead of DateTimeOffset, then you can call the DateTime property

DateTime dateTime = dateTimeOffset .DateTime;

Answer 2

I use following extension methods for epoch conversion

public static int GetEpochSeconds(this DateTime date)
    {
        TimeSpan t = DateTime.UtcNow - new DateTime(1970, 1, 1);
        return (int)t.TotalSeconds;
    }

public static DateTime FromEpochSeconds(this DateTime date, long EpochSeconds)
    {
        var epoch = new DateTime(1970, 1, 1, 0, 0, 0, DateTimeKind.Utc);
        return epoch.AddSeconds(EpochSeconds);

    }