Unsupported locales

Hello,

Just wondering whats the best way to handle an unsupported locale. We cater for a number of locales which are all supported but we now have need for Urdu but this isn't in the list of supported locales on our server. Has anyone ran into similair issues and how did they solve it? We're passing the locale to lsDateFormat and similar functions around the system, how can we get these working without errors?

Thanks