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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.
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)
There is the free https://date.nager.at/ service. I found it useful for some projects, although I had to "borrow" some dates from Liechtenstein and Germany when working on requirements for an Austrian customer.
Unfortunately I have been looking here for a more complete service which includes some other dates like school holidays. For Germany we have https://ferien-api.de/. The bank-holidays offering comes close and adds a bit more which would be nice for travel plans, but so far, just for querying a few dates with curl once a month for private use, the pricing and usage restrictions appear prohibitive to me.
