Useful macOS defaults: Calendar

Calendar settings live under com.apple.iCal (the original app name). After changing these, quit and reopen Calendar.

Set the first day of the week

defaults write com.apple.iCal "first day of week" -int 1

Values:

Show week numbers

Display week numbers in the month and year views:

defaults write com.apple.iCal "Show Week Numbers" -bool true

Default calendar view

Set what Calendar shows when you open it:

defaults write com.apple.iCal "Default view" -int 2

Values:

Day start and end times

Set when the day begins and ends in the Calendar view (in minutes from midnight):

# Start at 8:00 (8 × 60 = 480)
defaults write com.apple.iCal "first minute of work hours" -int 480

# End at 18:00 (18 × 60 = 1080)
defaults write com.apple.iCal "last minute of work hours" -int 1080

Default event duration

Set the default length for new events in minutes:

defaults write com.apple.iCal "Default duration" -int 30

Show birthdays calendar

defaults write com.apple.iCal "display birthdays calendar" -bool true

Show holidays calendar

defaults write com.apple.iCal "add holidays calendar" -bool true

Default alert for events

Set a default alert for new events in minutes before the event:

defaults write com.apple.iCal "Default alarm offset" -int 15

Set to 0 for no default alert.

Default alert for all-day events

Set a default alert for all-day events. This uses a different scale (days before, as a negative number of minutes):

# Alert at 9:00 on the day of the event
defaults write com.apple.iCal "Default all day alarm offset" -int 540

Time zone support

Turn on time zone support (lets you set events in different time zones):

defaults write com.apple.iCal "TimeZone support enabled" -bool true

Read all current Calendar settings

defaults read com.apple.iCal

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