Build a calendar around time zones and real workflows

A calendar grid is easy to draw and surprisingly difficult to get right. All-day events, time zones, daylight-saving changes, and keyboard interaction become visible as soon as people rely on it for real schedules.

This updated resource replaces the historical iCal-like jQuery tutorial. It focuses on choosing and integrating a component rather than reviving an old plugin download.

Decide whether you need a calendar

An agenda list is often better on a phone and easier to scan when there are only a few events. Use a month or week grid when spatial relationships between dates are essential. Provide a readable list alternative for dense schedules.

FullCalendar is a repository to examine for a full calendar interface. Review the exact packages you plan to use: core and premium features have different licensing. TOAST UI Calendar is another candidate to investigate against your framework and maintenance requirements.

Model the data before styling the grid

Distinguish a date-only value from a timestamp. “Holiday on June 10” should not shift to June 9 merely because a visitor is in another time zone. Store timed events with an explicit convention and document how the user chooses or sees the display zone.

Represent recurring events deliberately rather than duplicating a guessed number of occurrences forever. If importing calendar files, use a parser that supports the parts of the format you accept and test daylight-saving boundaries.

Test the interaction

Create events that overlap, cross midnight, span several days, or have very long titles. Test keyboard navigation and a narrow screen. A drag-and-drop interface still needs another way to change a date or time.

When migrating a legacy calendar, keep event identifiers and links stable. Compare a known set of records in the old and new views before making the new widget the only way to reach them.