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Fix date format string to ignore per-user Windows regional overrides #62

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Merged
albertospelta merged 1 commit into from
Jul 14, 2026
Merged

Fix date format string to ignore per-user Windows regional overrides #62

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5 changes: 4 additions & 1 deletion src/Dax.Template/Tables/Dates/BaseDateTemplate.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -27,8 +27,11 @@ public BaseDateTemplate(T config, CustomTemplateDefinition template, Predicate<C
protected override string? GetDefaultFormatString(Dax.Template.Model.Column column, Microsoft.AnalysisServices.Tabular.Model model)
{
string isoCulture = string.IsNullOrWhiteSpace(IsoFormat) ? model.Culture : IsoFormat;
// useUserOverride: false - a template must produce the same DAX/TOM output regardless of the
// machine's personal Windows regional-format overrides (Control Panel > Region), which
// `new CultureInfo(name)` otherwise applies by default even for a fully-qualified culture name.
return (column.DataType == DataType.DateTime)
? new CultureInfo(isoCulture).DateTimeFormat.ShortDatePattern.Replace('M', 'm')
? new CultureInfo(isoCulture, useUserOverride: false).DateTimeFormat.ShortDatePattern.Replace('M', 'm')
: null;
}

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