Compatible with iOS 5 and 6 and with all iPods, iPhones and iPads.
This MobileCalendar extension provides you with week numbers WITHIN the standard calendar app as well as on the calendar app icon.
It also shows public holidays for the following countries: Australia, Austria, Brazil, Bulgary, Canada, China, Christian, Croatia, Czech Republic, Denmark, Finland, France, Germany, Greece, Hong Kong, Hong Kong (ch), Hungary, India, Indonesia, Iran, Ireland, Islamic, Italy, Japan, Jewish, Latvia, Lithuania, Malaysia, Mexico, Netherlands, New Zealand, Norway, Philippines, Poland, Portugal, Romania, Russia, Serbia, Singapore, Slovakia, Slovenia, South Africa, South Korea, Spain, Sweden, Taiwan, Thailand, Turkey, UK, Ukraine, USA, Vietnam
See larger Screenshots below.