How to Convert a DateTime Object to an ISO 8601 String in C#?

C# DateTime to ISO 8601 String Conversion

Efficiently exchanging date and time data requires a standardized format, and ISO 8601 ("yyyy-MM-ddTHH:mm:ssZ") is a popular choice. Here's how to achieve this conversion in C#:

One method involves custom date-time formatting:

<code class="language-csharp">DateTime.UtcNow.ToString("yyyy-MM-ddTHH\:mm\:ss.fffffffzzz", CultureInfo.InvariantCulture);</code>

This produces an ISO 8601-like string (e.g., "2008-09-22T13:57:31.2311892-04:00"). For broader compatibility, however, the "round-trip" format is preferred:

<code class="language-csharp">DateTime.UtcNow.ToString("o", CultureInfo.InvariantCulture);</code>

This yields a string like "2008-09-22T14:01:54.9571247Z", adhering to the ISO 8601 standard. A more concise format is also available:

<code class="language-csharp">DateTime.UtcNow.ToString("yyyy-MM-ddTHH:mm:ssZ", CultureInfo.InvariantCulture);</code>

This offers a balance between precision and brevity for ISO 8601 representation. Choose the method that best suits your specific needs and compatibility requirements.

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