Converting Unix Timestamps to DateTime and Vice Versa in C#

In the world of programming, dealing with timestamps is a common task, especially when working with date and time data. Unix timestamps, representing the number of seconds elapsed since January 1, 1970, are widely used. Fortunately, in C#, converting Unix timestamps to DateTime objects and vice versa is straightforward, thanks to built-in functionality. Let's explore how to accomplish this task.

Converting Unix Timestamp to DateTime:

  • Unix Timestamp Definition: Unix timestamps are numbers representing the number of seconds elapsed since January 1, 1970, 00:00:00 UTC.
  • Using DateTimeOffset: In C#, we can use the DateTimeOffset structure, which provides methods for converting Unix timestamps to DateTime objects.
  • FromUnixTimeSeconds Method: The FromUnixTimeSeconds method of the DateTimeOffset structure allows us to convert a Unix timestamp to a DateTimeOffset object.
  • UtcDateTime Property: We can then access the UtcDateTime property of the DateTimeOffset object to get the corresponding DateTime object in UTC.
  • Example Code:
long unixTimestamp = 1642867200; // Unix timestamp representing "2022-01-22 00:00:00 UTC"
DateTimeOffset dateTimeOffset = DateTimeOffset.FromUnixTimeSeconds(unixTimestamp);
DateTime dateTime = dateTimeOffset.UtcDateTime;

Converting DateTime to Unix Timestamp:

  • DateTime Definition: DateTime objects represent specific points in time.
  • Using DateTimeOffset: Similar to the conversion from Unix timestamp to DateTime, we can utilize the DateTimeOffset structure for this conversion as well.
  • ToUnixTimeSeconds Method: The ToUnixTimeSeconds method of the DateTimeOffset structure converts a DateTime object to a Unix timestamp.
  • Example Code:
DateTime dateTime = DateTime.UtcNow; // Get current UTC DateTime
long unixTimestamp = ((DateTimeOffset)dateTime).ToUnixTimeSeconds();


These conversion methods are available in C# starting from version 4.6.1 of the .NET framework.


Converting Unix timestamps to DateTime objects and vice versa in C# is essential when working with time-related data. By leveraging the DateTimeOffset structure and its methods, this task becomes straightforward and efficient. Whether you need to handle Unix timestamps or DateTime objects, C# provides the necessary tools to seamlessly convert between the two representations.

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