Digital calendar

A digital calendar can be viewed as an extension of many of the features provided by time management software such as desk accessory packages and computer office automation systems.

Unix calendar programs checks current directory or user directories for files with calendar entries (date separated with tab character) and prints lines that begin with today's date or tomorrow's.

[1] There is a separate cal program that just prints a calendar for a month or a year and the date of Easter originally from Version 1 AT&T UNIX (1971).

Since the early 2000s, PDAs and EDAs have been replaced by smartphones and tablets with similar functionality.

Some appointment software has the ability to automatically suggest shortened events by default or in cases when there are back-to-back meetings in a calendar.

Timeblocking is a technique where users can organize their days into segments where they set aside specified periods of time for various tasks.

With digital calendars, it is possible to do this interactively and with the option of sharing your availability and reserved time with others.

Availability and capacity checking is an advanced function which can check the availability of all other employee and resource calendars in a group, and which may be useful assigning work decide on projects as part of resource planning.

Collaborative scheduling means that the software suggests meeting times when all participants are free.

Various reminder techniques can be used, such as pop-up notifications, dialog boxes or auditory alarms 15 minutes or 1 hour before an event.

Some examples of international or regional settings might be: It is a common functionality to have a calendar on computers and smartphones, often via locally installed email programs or webmail that can be accessed with a standard browser.

Some examples of locally installed applications for individual use are the Lightning extension for Mozilla Thunderbird, Microsoft Outlook without Exchange Server, or Windows Calendar.

Web-based interfaces allow users to access their calendars from any computer, tablet or mobile phone with a web browser.

A digital calendar in week view with 24-hour time
A digital calendar in month view with ISO week numbers
The first day of the week in various countries according to the Common Locale Data Repository project: [ 7 ]
Monday
Friday
Saturday
Sunday
Table showing different methods for week numbering:
Red frame: ISO 8601 (international week numbers)
Blue background: USA and Canada
Green frame and text: Middle East
— Each table line represents the period around the New Year when January 1 falls on a specific weekday, and hence the start of the weekday counting.
Use of 24-hour or 12-hour clock in different countries:
24 hours
24 hours written (12 orally)
Both are common
12 hours