Sharepoint Change Site Calendar type

using (SPSite oSiteCollection = new SPSite("http://localhost:2020"))
{
    using(SPWeb oWebsiteRoot = oSiteCollection.RootWeb)
    {
        SPRegionalSettings oRegionalSettings = oWebsiteRoot.RegionalSettings;
        oRegionalSettings.CalendarType = 6;  // Hijri Calendar
        oRegionalSettings.AdjustHijriDays = 2;

        oWebsiteRoot.Update();
    }
}

  CalendarType property  values:

• 0 — None
• 1 — Gregorian
• 3 — Japanese Emperor Era
• 5 — Korean Tangun Era
• 6 — Hijri
• 7 — Buddhist
• 8 — Hebrew Lunar
• 9 — Gregorian Middle East French Calendar
• 10 — Gregorian Arabic Calendar
• 11 — Gregorian Transliterated English Calendar
• 12 — Gregorian Transliterated French Calendar
• 16 — Saka Era

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