Return Dates In English irrespective of Regional Settings

[NeilRP]

I have produced a graph within an Excel application with months "Jan-05", "Feb-05", "Mar-05", etc along the x-axis. However, a colleague requires to use this in the Netherlands where (unsurprisingly) regional settings are in Dutch. Producing this graph, the month names are translated to Dutch, so "Okt" instead of "Oct" appears. This would be fine except he needs to use this application to produce presentations which will always be in English. He could always reset his regional settings back and fore between English and Dutch, but this is not a very professional solution.
Is there any way to force the date format always to display English regardless of regional settings?

Thanks,
NeilRP