- For a date and time value, if a composite formatting method with a non-null <xref:System.IFormatProvider> argument is called, the runtime requests a <xref:System.Globalization.DateTimeFormatInfo> object from its <xref:System.IFormatProvider.GetFormat%2A?displayProperty=nameWithType> method. If it is unable to supply one, if the value of the argument is `null`, or if the composite formatting method does not have an <xref:System.IFormatProvider> parameter, the <xref:System.Globalization.DateTimeFormatInfo> object for the current thread culture is used.
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