Example from Span<T> in CoreCLR

SpanTExample.cs

ReadOnlySpan<char> valueSpan = value.AsReadOnlySpan();
if (!Int32.TryParse(valueSpan.Slice(0, 4), NumberStyles.None, NumberFormatInfo.InvariantInfo, out year) ||
    !Int32.TryParse(valueSpan.Slice(5, 2), NumberStyles.None, NumberFormatInfo.InvariantInfo, out month) ||
    !Int32.TryParse(valueSpan.Slice(8, 2), NumberStyles.None, NumberFormatInfo.InvariantInfo, out day))
{
    // Couldn't convert integer, fail
    return null;
}
// see entire example : https://github.com/dotnet/coreclr/blob/a16fdf04c50fd7b14b939835a040bd21084f1dc4/src/mscorlib/shared/System/Globalization/JapaneseCalendar.Win32.cs#L162-L165