[Feature]: Culture-dependent DateTime formatting in test reports

[kzrnm]

Problem Statement

TUnit/TUnit.Engine/Reporters/Html/HtmlReporter.cs

Line 367 in 46029b7

Timestamp = DateTimeOffset.UtcNow.ToString("dd MMM yyyy, HH:mm:ss 'UTC'"),

Currently, DateTimeOffset.UtcNow.ToString("dd MMM yyyy, HH:mm:ss 'UTC'") is used as a fixed date format.
However, dd MMM yyyy is an English-oriented format and often does not fit other languages well. For example, in Japanese it becomes something like 08 5月 2026, 17:40:20 UTC, which is very unnatural as a Japanese DateTime representation.

If using the "dd MMM yyyy, HH:mm:ss 'UTC'" format, I think InvariantCulture should be specified.

Proposed Solution

Change the places using DateTimeOffset.UtcNow.ToString("dd MMM yyyy, HH:mm:ss 'UTC'") to something like the following.

• DateTimeOffset.UtcNow.ToString("dd MMM yyyy, HH:mm:ss 'UTC'", CultureInfo.CurrentCulture.DateTimeFormat.FullDateTimePattern, CultureInfo.InvariantCulture)

Alternatives Considered

It might be better to use a culture-dependent format instead. In that case, it would probably make more sense to display the time in local time rather than UTC.

• DateTimeOffset.Now.ToString(CultureInfo.CurrentCulture.DateTimeFormat.FullDateTimePattern)
• DateTimeOffset.Now.ToString($"{CultureInfo.InvariantCulture.DateTimeFormat.LongDatePattern} {CultureInfo.InvariantCulture.DateTimeFormat.LongTimePattern}")
• DateTimeOffset.Now.ToString($"{CultureInfo.InvariantCulture.DateTimeFormat.ShortDatePattern} {CultureInfo.InvariantCulture.DateTimeFormat.LongTimePattern}")

Feature Category

Test Output / Reporting

How important is this feature to you?

None

Additional Context

No response

Contribution

• I'm willing to submit a pull request for this feature