How to Convert a DateTime Object to an ISO 8601 String?

Transforming DateTime Objects into ISO 8601 Strings

Standardized date and time representation is crucial when handling timestamps. The ISO 8601 format offers a precise and universally understood method. This guide details how to convert a DateTime object into an ISO 8601 string.

The "o" Formatter: The Recommended Approach

For optimal results, leverage the "o" formatter along with CultureInfo.InvariantCulture. This directly generates the round-trip ISO 8601 format, including the "Z" suffix indicating UTC time:

<code class="language-csharp">DateTime.UtcNow.ToString("o", CultureInfo.InvariantCulture);
// Example Output: 2023-03-08T17:36:28.9899302Z</code>

Customizing the Format

Should you need a specific ISO 8601 variation, utilize the ToString() method with a custom format string:

<code class="language-csharp">DateTime.UtcNow.ToString("yyyy-MM-ddTHH:mm:ssZ", CultureInfo.InvariantCulture);
// Example Output: 2023-03-08T17:36:28Z</code>

Important Consideration

Alternative methods may present inconsistencies, as noted in related discussions. Therefore, employing the "o" formatter or a defined custom format is strongly advised for reliable conversions.

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