Is there a service or Open API that exists out there for providing the dates of existing holidays in the US including observed holidays?

Unfortunately, from my google searches I've just found a paid service timeanddate.com and bank-holidays.com from this particular SO thread.

I intend to just build my own event calendar application for self learning.


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The system for (US) federal holidays is rather simple. As described in 5 USC 6103, it's basically just a short list of specific dates and rules for weekends.

This could certainly be integrated into your calendar but you might want to find a more complicated data source to practice with an API. To keep on the same theme, how about religious holidays? (example)

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