This App adds calendar week numbers (week 1, week 2, ...) to the standard iPhone or iPad calendar You can choose the calendar, where the calendar week numbers should be displayed. There is no need for a second calender App anymore for this task. You can choose the days of the week, where the week numbers should be displayed. For example only the first day of the week, or all days of the week. You can choose between two different week number schemas: • Weeks starts on Monday: This is the standardized version (DIN 1355 / ISO 8601) and is used for example in Europe. • Weeks starts on Sunday: This is used in the USA, Canada, Australia and New Zealand. If you sync your iPhone calendar with iCloud, MS Exchange or with your Mac or PC, the calendar week numbers will also be synced. Enjoy this great and helpful App