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Japanese new era date - 日本の新時代の日付

Since April 1, 2019, the new era name was announced for Japanese date Reiwa (令和).

I came across few question by programmers regarding Japanese date and most of it was showing old era as not all user had updated their operating systems libraries.

On April 25, Microsoft released packages for different Windows operating systems containing the updated registry key with the new era name. Update your device and check your registry to see if it has the new key, and then test your application.

The Japanese calendar is divided into eras, and for most of the modern age of computing, system have been in the Heisei era; however, on May 1, 2019, a new era began Reiwa (令和). Because this is the first time in decades for an era to change, software that supports the Japanese calendar will need to be tested to ensure it will function properly when the new era begins.

In the following sections, you will learn what you can do to prepare and test your application for the upcoming new era.

Lot of developers are struggling to change the date to show  `令和元年` as for most it still show the ggyy part as 平成.

For date to work as you need to update
https://support.microsoft.com/en-ae/help/4469068/summary-of-new-japanese-era-updates-kb4469068

Prepare for new era Japanese date
https://docs.microsoft.com/en-us/windows/uwp/design/globalizing/japanese-era-change

Era Handling for the Japanese Calendar
Many calendars have eras, such as AD/BC or CE/BCE. In the Japanese Calendar, years are described by nengō, a combination of the year number and era name. For example, 2009 is Heisei 21. In the past, Japanese era names changed frequently, but now the Japanese eras change only on imperial succession. Windows and Microsoft .NET have historically supported the four modern eras under this policy: Meiji, Taishō, Shōwa and Heisei.

With Windows 7, Windows Server 2008 R2, and the .NET Framework 4, Microsoft recognizes that additional eras may be added in the future. On these versions of Windows the era data is stored in the registry under the key:

https://docs.microsoft.com/en-us/windows/desktop/Intl/era-handling-for-the-japanese-calendar 





2019年4月1日から、日本の日付のレイワ(令和)の新しい時代名が発表されました。


日本語の日付に関するプログラマーからの質問はほとんどありませんでした。ほとんどのユーザーがオペレーティングシステムライブラリを更新したわけではないため、そのほとんどは古い時代を示していました。


4月25日に、Microsoftは、新しい紀元名の更新されたレジストリキーを含むさまざまなWindowsオペレーティングシステム用のパッケージをリリースしました。デバイスを更新し、レジストリに新しいキーがあるかどうかを確認してから、アプリケーションをテストします。


日本のカレンダーは時代に分かれており、現代のコンピューティング時代のほとんどでは、システムは平成にありました。ただし、2019年5月1日、新しい時代が始まりました。時代が変わるのは数十年ぶりであるため、日本の暦をサポートするソフトウェアをテストして、新しい時代が始まるときに正しく機能することを確認する必要があります。


次のセクションでは、次の新時代に向けてアプリケーションを準備およびテストするためにできることを学びます。


多くの開発者は、日付を変更して「令和元年」を表示するのに苦労しています。ほとんどの場合、まだ「成」としてぎこちない部分を表示しています。


更新する必要があるときに機能する日付
https://support.microsoft.com/en-ae/help/4469068/summary-of-new-japanese-era-updates-kb4469068

新しい時代の日本の日付に備える
https://docs.microsoft.com/en-us/windows/uwp/design/globalizing/japanese-era-change

日本のカレンダーの時代処理

多くのカレンダーには、AD / BCやCE / BCEなどの時代があります。 日本のカレンダーでは、年は年号と年号の組み合わせである年功によって記述されています。 たとえば、2009年は平成21年です。過去には、日本の時代の名前は頻繁に変更されましたが、現在では日本の時代は帝国の継承によってのみ変更されています。 WindowsおよびMicrosoft .NETは、このポリシーのもとで、明治、大正、昭和、平成の4つの現代を歴史的にサポートしてきました。


Windows 7、Windows Server 2008 R2、および.NET Framework 4では、Microsoftは将来さらに時代が追加される可能性があることを認識しています。 これらのバージョンのWindowsでは、時代データはレジストリのキーの下に保存されます。
https://docs.microsoft.com/en-us/windows/desktop/Intl/era-handling-for-the-japanese-calendar 
 

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