The Tool Desk
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Install FullCalendar and render a view
FullCalendar’s React guide currently lists @fullcalendar/react and temporal-polyfill as setup dependencies. A calendar also needs at least one plugin that supplies a view. The official guide’s example uses a day-grid plugin; the package names and configuration are documented in the React integration guide.
npm install @fullcalendar/react @fullcalendar/daygrid temporal-polyfillImport the component and view plugin, then provide the plugin and initial view as props:
import FullCalendar from '@fullcalendar/react'
import dayGridPlugin from '@fullcalendar/daygrid'
export default function Calendar() {
return (
<FullCalendar
plugins={[dayGridPlugin]}
initialView="dayGridMonth"
/>
)
}Choose a view plugin that matches the calendar layout your app needs. FullCalendar’s React component accepts calendar options as props; available options and plugins are described in its documentation.
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Add event data
Each event should at minimum have a title and start. Set end and allDay explicitly when the event’s duration or all-day status matters. An id is useful when your application needs to identify or update a particular event.
const events = [
{
id: 'planning',
title: 'Project planning',
start: '2026-10-08T10:00:00',
end: '2026-10-08T11:00:00',
allDay: false,
},
{
id: 'holiday',
title: 'Office closed',
start: '2026-10-12',
allDay: true,
},
]
export default function Calendar() {
return (
<FullCalendar
plugins={[dayGridPlugin]}
initialView="dayGridMonth"
events={events}
/>
)
}These fields follow FullCalendar’s event parsing rules. Extra application-specific fields, such as a category or description, are available to rendering hooks through extendedProps. See Event Parsing for the complete property behavior.
Render custom event content
For JSX content, pass an eventContent callback. The React integration supports JSX from this hook. For example, an event with a category can include a short label in its content:
const events = [
{
title: 'Project planning',
start: '2026-10-08T10:00:00',
category: 'Team',
},
]
function renderEventContent(info) {
return (
<>
<strong>{info.event.title}</strong>
<span> {info.event.extendedProps.category}</span>
</>
)
}
<FullCalendar
plugins={[dayGridPlugin]}
initialView="dayGridMonth"
events={events}
eventContent={renderEventContent}
/>Use a stable event array and callback if the parent renders frequently. Inline arrays and functions have new identities on each render; for a larger or frequently updated calendar, define data outside the component or use React’s useMemo and useCallback as appropriate. FullCalendar’s React guide explains its reactive props.
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Pass a callback such as dateClick to respond when a user selects a date. The relevant interaction plugin and options depend on the behavior required; consult the FullCalendar documentation for the precise setup. Keep the callback’s date interpretation consistent with the calendar’s configured time zone.
For events stored on a server, use a documented event source rather than assuming the browser already has every record. A function event source can fetch the visible date range, and FullCalendar can request updated data as a user navigates or changes views. Event sources and date navigation are separate capabilities in the documentation.
Get event dates and all-day spans right
FullCalendar treats an event’s start as inclusive and its end as exclusive. An all-day event with a start of September 1 and an end of September 3 therefore covers September 1 and 2, not September 3. If your database stores inclusive end dates, convert them deliberately when creating calendar records.
When allDay is true, time components are ignored. If it is omitted, FullCalendar infers the value: date-only endpoints imply an all-day event, while a time on either endpoint implies a timed event. For timed events, use ISO 8601 date-time strings for both start and end to avoid ambiguity. These rules are detailed in Event Parsing.
Choose a time zone intentionally
The timeZone option affects event placement and displayed text, how callback and API dates are interpreted, what date range event sources request, and how strings without a UTC offset are parsed. Decide whether events should follow each user’s browser zone, use UTC consistently, or display in a named region such as America/New_York. FullCalendar documents these consequences in its time zone guide.
Do not treat a date-only value, such as 2026-10-12, as interchangeable with an instant such as 2026-10-12T09:00:00Z. A date-only value describes a calendar date; an instant identifies a moment that can appear on a different local date depending on the selected zone.
Represent recurring schedules
Built-in recurrence covers daily and weekly patterns, with optional time and date bounds. For a weekly schedule, the recurrence fields include daysOfWeek, startTime, endTime, startRecur, and endRecur. The recurrence end bound is exclusive, so an occurrence on that date is not included.
const events = [
{
title: 'Team stand-up',
daysOfWeek: [1, 3, 5],
startTime: '09:30',
endTime: '09:45',
startRecur: '2026-10-01',
endRecur: '2026-11-01',
},
]This models a Monday, Wednesday, and Friday schedule within the stated bounds. For more powerful recurrence rules, FullCalendar documents an RRule connector. Use the Recurring Events guide to choose between simple built-in patterns and the connector; complex exceptions or recurrence conventions should not be assumed to fit the basic fields.
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Review keyboard and screen-reader behavior
FullCalendar documents WAI-ARIA techniques, descriptive labels, and keyboard focus for interactive elements in its accessibility guide. By default, only events with a url are tabbable. Set eventInteractive when all events should be focusable, and make sure custom event content and handlers have meaningful names and work with a keyboard.
Test the finished interface using keyboard-only navigation and assistive technology. A library’s accessibility guidance does not establish that every custom rendering or interaction in your app is accessible.
Library or custom calendar grid?
FullCalendar documents view plugins, event handling, recurrence options, and event sources, but that does not make it the best choice for every project. Compare the behavior you need with the setup and styling control you want.
Quick Recap
- Choose a library when you need multiple calendar views, event interactions, data sources, or recurring schedules without maintaining all date and navigation logic yourself.
- Consider a custom grid when the interface is intentionally narrow and bespoke, and your team is prepared to implement date calculations, navigation, event layout, keyboard behavior, and ongoing edge-case maintenance.
- Check project constraints before committing: dependency and bundle requirements, desired styling, recurrence complexity, data-loading needs, and the accessibility behavior your product requires.
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