C# Epoch Time to Real Time Conversion Methods
This guide demonstrates how to convert Unix epoch time (seconds since January 1, 1970, UTC) to a readable date and time in C#. Several approaches cater to different .NET versions.
Modern .NET (Core >= 2.1 and later):
The simplest method leverages built-in functions:
DateTime realTime = DateTime.UnixEpoch.AddSeconds(epochSeconds); // For seconds DateTime realTimeMillis = DateTime.UnixEpoch.AddMilliseconds(epochMilliseconds); // For milliseconds
Using DateTimeOffset (Recommended since 2020):
DateTimeOffset provides improved time zone handling:
DateTimeOffset realTimeOffset = DateTimeOffset.FromUnixTimeSeconds(epochSeconds); // For seconds DateTimeOffset realTimeOffsetMillis = DateTimeOffset.FromUnixTimeMilliseconds(epochMilliseconds); // For milliseconds DateTime realTime = realTimeOffset.DateTime; // Extract DateTime if needed
For Older .NET Versions (Pre-2020):
For older .NET frameworks lacking the above methods, a custom function is necessary:
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 given unixTime (in seconds) to the Unix epoch, resulting in a DateTime object representing the real time. Remember to handle potential exceptions (e.g., ArgumentOutOfRangeException).
Choose the method most appropriate for your .NET version. DateTimeOffset is generally preferred for its enhanced precision and time zone awareness.
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