The following options are available under Edit ▸ Preferences ▸ Calendar and Tasks ▸ General.
Time format:
Choose between twelve-hour (AM/PM) and twenty-four-hour time formats.
Time zone and Second zone:
The city you are located in, and optionally a second city.
Week starts on:
Select the day to display as the first in each week.
Work days:
Define which week days are work days.
Day begins:
Define at which time your work day begins.
Day ends:
Define at which time your work day ends.
You can change the format of the Date column by setting your preferred format.
The placeholders in the format expression are strftime formats. For a complete list of available strftime formats, run date --help in the Terminal application.
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