How Can I Convert Epoch Time to Real Time in C#?

Converting Unix Epoch Time to a Human-Readable Date and Time in C#

This guide demonstrates several methods to convert Unix epoch time (seconds or milliseconds since January 1, 1970, 00:00:00 UTC) into a standard date and time format within C#.

Modern Approaches (.NET Core 2.1 and later):

For optimal efficiency in newer .NET versions, leverage these built-in methods:

• AddSeconds: DateTime.UnixEpoch.AddSeconds(epochSeconds) (for epoch time in seconds)
• AddMilliseconds: DateTime.UnixEpoch.AddMilliseconds(epochMilliseconds) (for epoch time in milliseconds)

Alternative Method (Suitable for older .NET versions):

This approach utilizes DateTimeOffset for enhanced precision and handling of time zones:

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

Legacy Approach:

While functional, this method is less concise than the modern alternatives:

1. Define an epoch starting point: private static readonly DateTime epoch = new DateTime(1970, 1, 1, 0, 0, 0, DateTimeKind.Utc);
2. Create a conversion method: public static DateTime FromUnixTime(long unixTime)
3. Perform the conversion: return epoch.AddSeconds(unixTime);

Choose the method best suited to your .NET framework version and coding style. The modern AddSeconds and AddMilliseconds approaches are generally preferred for their simplicity and performance.

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