How to Convert Epoch Time to a Human-Readable Date and Time in C#?

C# Epoch Time Conversion: Human-Readable Dates and Times

Epoch time, representing seconds since January 1, 1970, 00:00:00 UTC, can be easily converted to a user-friendly date and time format in C#. This guide explores several methods.

Modern .NET Approaches (.NET Core 2.1 and later):

The most straightforward approach in recent .NET versions involves using DateTime.UnixEpoch:

• DateTime.UnixEpoch.AddSeconds(epochSeconds): Adds the specified number of seconds to the epoch, yielding a DateTime object.
• DateTime.UnixEpoch.AddMilliseconds(epochMilliseconds): Similar to the above, but uses milliseconds.

Leveraging DateTimeOffset:

For more precise time zone handling, consider DateTimeOffset:

• DateTimeOffset dateTimeOffset = DateTimeOffset.FromUnixTimeSeconds(epochSeconds)
• DateTimeOffset dateTimeOffset2 = DateTimeOffset.FromUnixTimeMilliseconds(epochMilliseconds)
• To get a standard DateTime object: DateTime dateTime = dateTimeOffset.DateTime

Classic Method (for older .NET frameworks):

If you're working with older .NET versions lacking the above methods, this utility function provides the same functionality:

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);
}

This function adds the unixTime (in seconds) to the epoch start time. Remember to adjust for milliseconds if necessary.

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