The Indian Church adopted the Gregorian Paschalion and Menaion in 1953, partly due to influence from the Indian government.
The more I learn about it, the more I realise it was not "partly" but mostly due to secular concerns. It was deemed better to change the calendar and allow as many as possible the chance to have days off for holy days and go to church for divine worship and the sacraments rather than stick with the old calendar and not allow a considerable amount of people this privilege (the government wasn't going to give everyone every religious holiday they wanted, and wanted to "streamline" the Christians). Although I would prefer the old calendar, I wouldn't criticise the decision to change in this instance.
