Nager.Date is a popular project to query holidays. We currently support over 100 countries. The project is based on .NET but provides a REST interface to retrieve the data. There are several ways to use Nager.Date, there is a public api, you can start your own docker container or you can use the nuget package.

Nager.Date is open source software and is completely free for commercial use. If you would like to support the project you can award a GitHub star ⭐ or send a small donation to me 🍻

If you are use .net you can install the package via nuget for all other languages we have a docker image with a web api available.

The package is available via nuget

PM> install-package Nager.Date

• public use the public api date.nager.at API
  • If you need more as 50 requests per day please use your own private api (docker).
• private use the docker container available on dockerhub
  • To run a local instance of the docker image run the following command
    docker run -e "EnableCors=true" -e "EnableIpRateLimiting=false" -e "EnableSwaggerMode=true" -p 80:80 nagerat/nager-date
    • EnableCors=true activate CORS support
    • EnableIpRateLimiting=false disable IpRateLimiting
    • EnableSwaggerMode=true activate Swagger UI as start page
    • -p 80:80 publish the port 80 from the docker to your host.

If this project help you reduce time to develop, you can give me a beer 🍺

var publicHolidays = DateSystem.GetPublicHoliday(2017, "DE");
foreach (var publicHoliday in publicHolidays)
{
    //publicHoliday...
    //publicHoliday.Date -> The date
    //publicHoliday.LocalName -> The local name
    //publicHoliday.Name -> The english name
    //publicHoliday.Fixed -> Is this public holiday every year on the same date
    //publicHoliday.Global -> Is this public holiday in every county (federal state)
    //publicHoliday.Counties -> Is the public holiday only valid for a special county ISO-3166-2 - Federal states
    //publicHoliday.Type -> Public, Bank, School, Authorities, Optional, Observance
}

var startDate = new DateTime(2016, 5, 1);
var endDate = new DateTime(2018, 5, 31);
var publicHolidays = DateSystem.GetPublicHoliday(startDate, endDate, CountryCode.DE);
foreach (var publicHoliday in publicHolidays)
{
	//publicHoliday...
}

var date = new DateTime(2017, 1, 1);
if (DateSystem.IsPublicHoliday(date, CountryCode.DE))
{
    Console.WriteLine("Is public holiday");
}

var date = new DateTime(2017, 1, 1);
if (DateSystem.IsWeekend(date, CountryCode.DE))
{
    Console.WriteLine("Is weekend");
}

The list of supported countries can be found here.

• telephone systems
• carrier (land transport)
• time recording

Mark Seemann - Simple holidays