Many people and professions rely on week numbers to plan events and schedule their time, particularly on a longer term yearly basis. By default, the iOS Calendar app does not show week numbers, but a simple settings change can make it so week numbers appear in the Calendar app of iPhone, iPad, and iPod touch.
This is a really welcome change if you use week numbers for planning, and it’s quite easy to switch on or off to suit user preferences:
1 Open the Settings app and go to “Mail, Contacts, Calendars”
2 Scroll down to the “Calendars” section of the preferences
3 Toggle “Week Numbers” to the ON position
4 Open the Calendar app into Month view to see the change