But 20% of the surface of Argentina should be at GMT-5. It's easier fot transport and communication to ignore it, instead of splinting the country in two time zones in particular because it includes there are only a few big cities there. Anyway, they usually have double summer time but during that period they had triple summer time! There were a lot of complains from Mendoza and other cities there, and for some time we had a few actives time zones.
It was a nightmare to configure the time in the computer, because we didn't have a timezone and Greenland was not making random funny changes. We also canceled one of the switches a week before the date, so whoever is in charge of that in each OS still hate us.
I'm not sure if it's related, but we had very popular TV shows at "midnight".