What are calendar APIs?

Calendar APIs provide programmatic access to calendar data, public holiday schedules, scheduling services, event management, and date calculation utilities for integration into apps and workflows.

Is there a free API for public holidays?

Yes. APIs like Calendarific and Nager.Date provide free tiers for querying public holidays across dozens of countries, returning JSON data with holiday names and dates.

How do I integrate Google Calendar with my app?

The Google Calendar API uses OAuth 2.0. You register your app in Google Cloud Console, obtain credentials, and use the REST API or official SDKs to read and write calendar events on behalf of users.

Calendar APIs

Calendar and scheduling services

15 APIs in this category

Showing 15 of 15 APIs

Abstract Public Holidays

Access national, regional, and religious holidays worldwide via API

Auth: apiKey HTTPS CORS: Yes

Calendarific

Global holiday and observance API for countries, regions, and religions

Auth: apiKey HTTPS CORS: Unknown

Church Calendar

Catholic liturgical calendar with daily readings and feast days

Auth: No HTTPS CORS: Unknown

Czech Namedays Calendar

Lookup Czech name days and retrieve corresponding celebration dates

Auth: No HTTPS CORS: Unknown

Festivo Public Holidays

Advanced and fast public holiday and observance service

Auth: apiKey HTTPS CORS: Yes

Google Calendar

Create, read, and modify Google Calendar events programmatically

Auth: OAuth HTTPS CORS: Unknown

Hebrew Calendar

Convert between Gregorian and Hebrew calendars, fetch Shabbat and holiday times

Auth: No HTTPS CORS: Unknown

Holidays

Provides historical and upcoming public holiday data

Auth: apiKey HTTPS CORS: Unknown

LectServe

Protestant liturgical calendar API

Auth: No HTTPS CORS: Unknown

Nager.Date

Provides public holidays for more than 90 countries in JSON format

Auth: No HTTPS CORS: No

Namedays Calendar

Fetch name days for multiple countries and regions

Auth: No HTTPS CORS: Yes

Non-Working Days (ICS)

Database of ICS files listing non-working days for various regions

Auth: No HTTPS CORS: Unknown

Non-Working Days API

Check working, non-working, or short days for Russia, CIS, USA and others

Auth: No HTTPS CORS: Yes

Russian Calendar

Check if a date is a Russian holiday or not via API

Auth: No HTTPS CORS: No

UK Bank Holidays

Official UK government API for bank holidays across England, Scotland, Wales, and Northern Ireland

Auth: No HTTPS CORS: Unknown

API	Description	Auth	HTTPS	CORS
Abstract Public Holidays	Access national, regional, and religious holidays worldwide via API	apiKey	✓	✓
Calendarific	Global holiday and observance API for countries, regions, and religions	apiKey	✓	?
Church Calendar	Catholic liturgical calendar with daily readings and feast days	No	✗	?
Czech Namedays Calendar	Lookup Czech name days and retrieve corresponding celebration dates	No	✗	?
Festivo Public Holidays	Advanced and fast public holiday and observance service	apiKey	✓	✓
Google Calendar	Create, read, and modify Google Calendar events programmatically	OAuth	✓	?
Hebrew Calendar	Convert between Gregorian and Hebrew calendars, fetch Shabbat and holiday times	No	✗	?
Holidays	Provides historical and upcoming public holiday data	apiKey	✓	?
LectServe	Protestant liturgical calendar API	No	✗	?
Nager.Date	Provides public holidays for more than 90 countries in JSON format	No	✓	✗
Namedays Calendar	Fetch name days for multiple countries and regions	No	✓	✓
Non-Working Days (ICS)	Database of ICS files listing non-working days for various regions	No	✓	?
Non-Working Days API	Check working, non-working, or short days for Russia, CIS, USA and others	No	✓	✓
Russian Calendar	Check if a date is a Russian holiday or not via API	No	✓	✗
UK Bank Holidays	Official UK government API for bank holidays across England, Scotland, Wales, and Northern Ireland	No	✓	?

Best Calendar and Scheduling APIs for Developers

A calendar API allows developers to integrate scheduling, public holiday lookups, event management, and date utilities into their applications. These APIs eliminate the need to maintain your own holiday databases or build scheduling logic from scratch.

CodeHelper's curated calendar API collection includes APIs covering holiday data, scheduling platforms, iCal feeds, and date calculation services.

What to look for in a calendar API

Country coverage: Holiday APIs should cover the regions your users are in, with accurate regional subdivision support.
iCal compatibility: APIs that return iCal format can be consumed by most calendar applications directly.
Timezone handling: Proper timezone support is essential for scheduling apps serving global users.

How to use this API directory

Browse the curated list of APIs below.
Click any API to visit its documentation.
Check the Auth column to understand what credentials you need.

Whether you are building a scheduling tool or a holiday-aware notification system, this free curated API directory saves you hours of research.

Calendar APIs

Abstract Public Holidays

Calendarific

Church Calendar

Czech Namedays Calendar

Festivo Public Holidays

Google Calendar

Hebrew Calendar

Holidays

LectServe

Nager.Date

Namedays Calendar

Non-Working Days (ICS)

Non-Working Days API

Russian Calendar

UK Bank Holidays

Best Calendar and Scheduling APIs for Developers

What to look for in a calendar API

How to use this API directory

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