A big issue is that people couldn't finalize any changes until the new era name had been decided and announced, which happened just a few weeks ago on April 1.
For things like Y2K, you could have done your deployment and testing long before it happened - for this change, everyone has just this one month to wait for any vendors involved to finalize, test and distribute their updates so that they can start deploying them on their own systems. No programming language or calendar library version older than March 31, 2019 could include proper support for Japanese dates of May.
For things like Y2K, you could have done your deployment and testing long before it happened - for this change, everyone has just this one month to wait for any vendors involved to finalize, test and distribute their updates so that they can start deploying them on their own systems. No programming language or calendar library version older than March 31, 2019 could include proper support for Japanese dates of May.