Nager.Date

Public holidays for more than 90 countries

Official docs outline

Extra Credit builds an outline of Nager.Date's docs the first time your work uses it. Until then, start at the official documentation.

Festivo Public Holidays Fastest and most advanced public holiday and observance service on the market
Hebrew Calendar Convert between Gregorian and Hebrew, fetch Shabbat and Holiday times, etc
Holidays Historical data regarding holidays
India Public Holidays Official Indian public holidays for the Central government and 36 states/UTs
Intellibook Appointment booking and availability API for salons and clinics
LectServe Protestant liturgical calendar
Namedays Calendar Provides namedays for multiple countries
Non-Working Days Database of ICS files for non working days
Non-Working Days Simple REST API for checking working, non-working or short days for Russia, CIS, USA and other
Public Holidays Data on national, regional, and religious holidays via API
Russian Calendar Check if a date is a Russian holiday or not
The Calendar Public holidays for US states and 30 countries plus sports and finance calendars as static JSON