Change how your calendar is displayed
In the Calendar app, swipe down from the top of the screen.
Settings > General.
• To change the day that the week starts on, in the First Day of the Week drop-down list, tap a day.
• To change the week to a 5-day work week, or a 7-day full week, in the Week View drop-down list, tap an option.
• To view week numbers, turn on the Display Week Numbers switch.
• To use growing numbers to indicate the busyness of a work day, turn on the Display Growing Numbers switch.
• To change the date that the year starts on, in the First Week of the Year drop-down lists, tap a date.
• To change your daily working hours, in the Working Hours section, in the Start and End drop-down lists, tap a