Holiday API

Accurate, up-to-date holiday information you can rely on.

Our Mission

Holiday API ( started in 2013 to rid the world of databases and spreadsheets full of stale holiday data. By taking an algorithmic approach to holiday generation, we're able to provide accurate and up-to-date holiday information that can be quickly and easily integrated into your application or website.

We've done extensive research on holiday observances, solar and lunar calendars, and the math behind it all. Because we're calculating data on the fly, we're able to offer a wide range of information that extends far into the future as well as the past.

As our customers regularly tell us, holidays are complex and we make it easy.

We eat, sleep, and breathe holiday information, so you don't have to.

In the 6 years since our inception, we have expanded to support 7713 holidays and observances in 208 countries and 76 regional states and provinces. We've even added support for over 100 languages to ensure the best possible experience, anywhere in the world.

With a goal of supporting every country and region on the planet, we're just getting started.

Meet the Team

Josh Sherman

Founder / Engineer

Josh Sherman is a full stack developer with over 20 years experience in technology, ranging from support to CTO. He has a passion for architecting scalable solutions with simple interfaces that help improve the quality of life of his fellow developers.

Favorite Holiday: Thanksgiving ๐Ÿฆƒ

Jenny Sherman

Content Creator

Jenny Sherman is an avid reader, blogger and content creator. With a background in homeschooling, a love of history, and a passion for learning about different cultures and its people, her contribution (in addition to moral support) is to research and weave an informative description of each countryโ€™s story.

Favorite Holiday: Halloween ๐ŸŽƒ

Justin Davis


Justin Davis is a seasoned user experience designer and developer, with over 20 years experience designing and building technology products, with companies like Google, Coke Zero and MetLife. Heโ€™s also the founder of ReviewCycle, a tool to help make review of creative assets easier and more productive.

Favorite Holiday: Christmas ๐ŸŽ„

Collin Brewer


Collin Brewer is a software creator and entrepreneur of 20 years. He believes that first and foremost, work should be fulfilling, and supportive to a rich life. After selling his software business, Collin now focuses his efforts on helping people work smarter, instead of harder.

Favorite Holiday: Christmas ๐ŸŽ…

Mark Peck

Design Consultant

Special Thanks

Wanted to give a special thanks to our friend Geoff Oliver for his design and logo work in the early days of the service. He's the reason the site is green, and for that, we thank him.

We'd also like to thank, in no particular order: Linode for helping us serve data at scale, Cloudflare for helping us to keep the bad actors away, Salvatore Sanfilippo for Redis and it's insanely fast I/O, the Debian Project for the most stable operating system on the planet, Rasmus Lerdorf for the language we love to hate (but really do love), Ryan Dahl for helping JavaScript and TypeScript consume the world, every person that's reached out to help us improve our product, and of course, everybody that's believed in us along the way.