LOL It's an interesting idea, but wouldn't work, it's been tried on several occasions, but you'd need to change everything, from clocks, computers, calenders etc, bespoke software would have to be rewritten, all credit and debit cards would have to be reprinted (since you'd have to decimalise months and years as well) the biggest problem with it is the size of the job involved, it's not like weights and measures, which were changed years ago, it would be a lot harder to do it now, as the attempts to introduce the litre to replace the pint in the UK proved recently, it was simply ignored by the general public.