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86d333ee94
* chore: Switch to Node 20 + Vitest * chore: migrate to vitest mock functions * chore: code style (switch to prettier) * test: re-enable long-running test Seems the switch to Node 20 and Vitest has vastly improved the code's and / or the test's runtime! see #1193 * chore: code style * chore: fix failing tests * Updated Documentation in README.md * Update contribution guidelines to state usage of Prettier * fix: set prettier printWidth back to 80 * chore: apply updated code style automatically * fix: set prettier line endings to lf again * chore: apply updated code style automatically --------- Co-authored-by: github-actions <${GITHUB_ACTOR}@users.noreply.github.com> Co-authored-by: Lars Müller <34514239+appgurueu@users.noreply.github.com>
36 lines
813 B
JavaScript
36 lines
813 B
JavaScript
// Zeller's Congruence Algorithm finds the day of the week from the Gregorian Date. Wikipedia: https://en.wikipedia.org/wiki/Zeller%27s_congruence
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export const zellersCongruenceAlgorithm = (day, month, year) => {
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if (
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typeof day !== 'number' ||
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typeof month !== 'number' ||
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typeof year !== 'number'
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) {
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throw new TypeError('Arguments are not all numbers.')
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}
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const q = day
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let m = month
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let y = year
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if (month < 3) {
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m += 12
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y -= 1
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}
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day =
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(q +
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Math.floor((26 * (m + 1)) / 10) +
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(y % 100) +
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Math.floor((y % 100) / 4) +
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Math.floor(Math.floor(y / 100) / 4) +
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5 * Math.floor(y / 100)) %
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7
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const days = [
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'Saturday',
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'Sunday',
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'Monday',
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'Tuesday',
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'Wednesday',
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'Thursday',
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'Friday'
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]
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return days[day]
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}
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