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Added information on next Japanese calendar era #9529

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Dec 11, 2018
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Added information on next Japanese calendar era #9529

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Added information on next Japanese calendar era
Dec 11, 2018
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Noted testing is for Windows only
Dec 11, 2018
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3 changes: 3 additions & 0 deletions docs/standard/datetime/working-with-calendars.md
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Expand Up @@ -131,6 +131,9 @@ However, there is one important exception. The default (uninitialized) value of

Calendars typically divide dates into eras. However, the <xref:System.Globalization.Calendar> classes in .NET do not support every era defined by a calendar, and most of the <xref:System.Globalization.Calendar> classes support only a single era. Only the <xref:System.Globalization.JapaneseCalendar> and <xref:System.Globalization.JapaneseLunisolarCalendar> classes support multiple eras.

> [!IMPORTANT]
> A new era in the <xref:System.Globlalization.JapaneseCalendar> and <xref:System.Globalization.JapaneseLunisolarCalendar> begins on May 1, 2019. This change affects all applications that use these calendars. See [Handling a new era in the Japanese calendar in .NET](https://blogs.msdn.microsoft.com/dotnet/2018/11/14/handling-a-new-era-in-the-japanese-calendar-in-net/) for more information and to determine whether your applications are affected. See [Prepare your application for the Japanese era change](~/windows/uwp/design/globalizing/japanese-era-change) for information on testing your applications on Windows to ensure their readiness for the era change.

### Eras and era names

In .NET, integers that represent the eras supported by a particular calendar implementation are stored in reverse order in the <xref:System.Globalization.Calendar.Eras%2A?displayProperty=nameWithType> array. The current era is at index zero, and for <xref:System.Globalization.Calendar> classes that support multiple eras, each successive index reflects the previous era. The static <xref:System.Globalization.Calendar.CurrentEra?displayProperty=nameWithType> property defines the index of the current era in the <xref:System.Globalization.Calendar.Eras%2A?displayProperty=nameWithType> array; it is a constant whose value is always zero. Individual <xref:System.Globalization.Calendar> classes also include static fields that return the value of the current era. They are listed in the following table.
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