How do you convert epoch time in C#?

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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;

Original answer

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);
}

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