How do you convert epoch time in C#?

Question

How do you convert Unix epoch time into real time in C#? (Epoch beginning 1/1/1970)

Answer 1

The latest version of .Net (v4.6) just added built-in support for Unix time conversions. That includes both to and from Unix time represented by either seconds or milliseconds.

• Unix time in seconds to DateTimeOffset:

DateTimeOffset dateTimeOffset = DateTimeOffset.FromUnixTimeSeconds(1000);

• DateTimeOffset to Unix time in seconds:

long unixTimeStampInSeconds = dateTimeOffset.ToUnixTimeSeconds();

• Unix time in milliseconds to DateTimeOffset:

DateTimeOffset dateTimeOffset = DateTimeOffset.FromUnixTimeMilliseconds(1000000);

• DateTimeOffset to Unix time in milliseconds:

long unixTimeStampInMilliseconds= dateTimeOffset.ToUnixTimeMilliseconds();

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Note: These methods convert to and from DateTimeOffset. To get a DateTime representation simply use the DateTimeOffset.DateTime property:

DateTime dateTime = dateTimeOffset.UtcDateTime;