correct implementation for Date to Day function

[chrisgalvan]

Fixes #1121
Implement correct modulus operator in javascript
Adjusted the year if month is Jan or Feb, since we are considering March as the starting month (based on the algorith)

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Describe your change:

• Add an algorithm?
• Fix a bug or typo in an existing algorithm?
• Documentation change?

Checklist:

• I have read CONTRIBUTING.md.
• This pull request is all my own work -- I have not plagiarized.
• I know that pull requests will not be merged if they fail the automated tests.
• This PR only changes one algorithm file. To ease review, please open separate PRs for separate algorithms.
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[appgurueu]

Fixing modulo looks like a reasonable fix to me. Adapting the formula is preferable however. You can then take it one step further.

[appgurueu]

Closing in favor of #1125 and #1126, which both get rid of the dirty month dict. using a simple if.