Worldwide, there are indeed different calendar systems, but mainly the Gregorian calendar is used. Many calendars can make notes and add events. Skip to content Animated Downloadable Calender Gif. You can send these animations by email to Calendeer friends, post them on facebook or on your homepage and also by messenger as WhatsApp, Skype and ICQ. All All Small Icons [px] Medium Icons  Large Icons  Exact Resolutions: 16 x 16px 24 x 24px 32 x 32px 48 x 48px 64 Kindle Gif 64px x px x px x px. The word calendar comes from the Latin Calendarium book entry. All All Commercial Commercial free. Animated GIFs A!.