Patch to add support for the Reiwa (令和) era in glibc: https://gist.github.com/marcan/15789cc55175fd12754a78cf81cd01fe … You can also just apply it to /usr/share/i18n/locales/ja_JP and run locale-gen.pic.twitter.com/5z3yeLgRLy
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But my understanding (that might be wrong) is the full year is in both eras and not just starting from May. But I guess that is technically correct to print it like that then
No, it depends on the date. No single date is written as being in both eras.
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