## Persian calendar now uses the Hijri solar algorithm

### Scope
Minor

### Version Introduced
4.6

### Source Analyzer Status
Available

### Change Description

Starting with the .NET Framework 4.6, the
<xref:System.Globalization.PersianCalendar?displayProperty=name> class uses the
Hijri solar algorithm. Converting dates between the
<xref:System.Globalization.PersianCalendar?displayProperty=name> and other
calendars may produce a slightly different result beginning with the .NET
Framework 4.6 for dates earlier than 1800 or later than 2023 (Gregorian).   

Also, <xref:System.Globalization.PersianCalendar.MinSupportedDateTime?displayProperty=nameWithType>
is now `March 22, 0622` instead of `March 21, 0622`.

- [ ] Quirked
- [ ] Build-time break

### Recommended Action
Be aware that some early or late dates may be slightly different when using the PersianCalendar in .NET Framework 4.6. Also, when serializing dates between processes which may run on different .NET Framework versions, do not store them as PersianCalendar date strings (since those values may be different).

### Affected APIs
* `T:System.Globalization.PersianCalendar`

### Category
Core

<!-- breaking change id: 134 -->