Top 18 Calendar APIs For Developers - Public APIs

Generates iCal calendar events that can be used across calendar applications.

Public and school holidays for many countries via an open REST API.

Various date and time calculations.

Bank holidays in England and Wales, Scotland and Northern Ireland.

Check if a date is a Russian holiday or not.

Database of ICS files for non working days.

Simple REST API for checking working, non-working or short days for Russia, CIS, USA and other.

Provides namedays for multiple countries.

Public holidays for more than 90 countries.

Protestant liturgical calendar.

Historical data regarding holidays.

Convert between Gregorian and Hebrew, fetch Shabbat and Holiday times, etc.

Display, create and modify Google calendar events.

Fastest and most advanced public holiday and observance service on the market.

Lookup for a name and returns nameday date.

Catholic liturgical calendar.

Worldwide Holidays.

Data on national, regional, and religious holidays via API.