Best Calendar APIs (2025)

Calendarific is a simple way to get all holidays for any country in the world via a JSON API

Industry-leading Holiday API. Over 5,000 holidays and thousands of descriptions. Trusted by the World’s leading companies

DigiDates is a powerful API that provides time and date calculations for a variety of use cases. Whether you need to calculate time differences, convert time zones, or determine the duration between two dates, DigiDates.de can help. Their API is designed to be easy to integrate into your application, with comprehensive documentation and support available to ensure a smooth integration process. With DigiDates.de, you can take advantage of advanced features like business day calculations and holiday schedules, making it easier to manage complex time-related operations. So why not explore the possibilities and see how DigiDates.de can help streamline your time and date calculations today?

Public holiday API service for several supported countries.

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

Display, create and modify Google calendar events

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

API for obtaining information about holidays.

Protestant liturgical calendar

Public holidays for more than 90 countries

Provides namedays for multiple countries

Check if a date is a Russian holiday or not