How Do I Convert Unix Epoch Time to a Real-Time DateTime Object in C#?

Effortlessly Convert Unix Epoch Time to DateTime in C#

Unix epoch time signifies the seconds elapsed since January 1st, 1970, 00:00:00 UTC. This guide demonstrates how to efficiently convert this to a C# DateTime object.

Modern .NET (>= 2.1): The Simplest Approach

.NET Core 2.1 and later offer streamlined methods:

• DateTime.UnixEpoch.AddSeconds(epochSeconds)
• DateTime.UnixEpoch.AddMilliseconds(epochMilliseconds)

These directly add the epoch offset (in seconds or milliseconds) to the base Unix epoch time.

Older .NET Versions:

For versions prior to .NET Core 2.1, utilize this concise function:

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);
}

Retrieving DateTime from DateTimeOffset:

To extract a DateTime object from a DateTimeOffset, simply use:

DateTime dateTime = dateTimeOffset.DateTime;

Important Update Note:

This solution has been updated for compatibility across different .NET versions. For optimal performance in newer .NET versions, leverage the DateTime.UnixEpoch methods.

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