Added additional holidays for regions and subdivisions in India (Issue #2182)

[ankushhKapoor]

Proposed change

• Extended the holiday list for multiple regions in India.
• Added holidays for various subdivisions and states, ensuring better coverage.
• Updated documentation to include the new subdivisions/states and their respective holidays.

This PR addresses Issue #2182, enhancing the holiday dataset by incorporating state-specific holidays and regional variations. The goal is to provide a more comprehensive representation of holidays in India, covering a wider range of locations.

I am a Winter of Code (WoC) 2025 contributor and am excited to contribute to the project with these updates. Let me know if any further modifications are needed!

Resolves #2182 .

Type of change

• New country/market holidays support (thank you!)
• Supported country/market holidays update (calendar discrepancy fix, localization)
• Existing code/documentation/test/process quality improvement (best practice, cleanup, refactoring, optimization)
• Dependency update (version deprecation/pin/upgrade)
• Bugfix (non-breaking change which fixes an issue)
• Breaking change (a code change causing existing functionality to break)
• New feature (new holidays functionality in general)

Checklist

• I've followed the contributing guidelines
• I've successfully run make check, all checks and tests are green

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (987ca01) to head (135e6d9).
Report is 6 commits behind head on dev.

Additional details and impacted files

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  Coverage   100.00%   100.00%           
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  Files          199       199           
  Lines        12134     12183   +49     
  Branches      1731      1736    +5     
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+ Hits         12134     12183   +49     

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[KJhellico]

@ankushhKapoor, good start! Are you planning to add other regional holidays? According to Wiki, there are a lot of them.

[KJhellico]

Offcial ISO3166-2 contains these names in the Indian System of Transliteration.

[PPsyrius]

Just my 2 cents here but we can probably include both this and ASCII-only version as aliases like what we've implemented for Italy a few months earlier.

[KJhellico]

@ankushhKapoor, you can look at example with several aliases for subdiv in Austria.

[ankushhKapoor]

@ankushhKapoor, good start! Are you planning to add other regional holidays? According to Wiki, there are a lot of them.

Thanks! Yep, I’m planning to add more regional holidays. The challenge is that each holiday falls on a different date every year, so I'm thinking of the most efficient approach to handle this. I'll add as many holidays as I can and will also include Hindi translations for each one.

[KJhellico]

The challenge is that each holiday falls on a different date every year, so I'm thinking of the most efficient approach to handle this.

You can use the same approach as for Diwali, Holi etc. Later, if we implement support for Indian calendar (actually, calendars), it will be possible to refactor this similarly to other lunar calendars.

[ankushhKapoor]

The challenge is that each holiday falls on a different date every year, so I'm thinking of the most efficient approach to handle this.

You can use the same approach as for Diwali, Holi etc. Later, if we implement support for Indian calendar (actually, calendars), it will be possible to refactor this similarly to other lunar calendars.

Yes, I’m also thinking of doing the same.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

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